Make sure the requested filename fits in the `bitfile_name` buffer before
copying it.

This squelches a warning from -D_FORTIFY_SOURCE.

Make sure there's room in the destination buffer for the whole source
string, plus the terminating NULL.

Error out early and print a helpful error message if they're not found.

This makes the `if` statement bodies indent by 4 spaces instead of
sometimes one tab and sometimes nothing.

changes from jethornton/mesaflash master branch

fix a couple of compile warnings

* origin/v3.3:
  read-hmid: report unknown pins better
  hm2_print_pin_file(): use find_module_name() instead of searching the list
  rename pin_find_module_name() to find_module_name()
  include gtag number of unknown gtags in pin list
  remove dead code
  7i96: fixup pins per connector
  don't segfault on unknown ethernet boards
  fix a typo in a comment
  fix SSR pin names
  fix sserial channel number in readhmid pin list
  rename the "Transformer" GTAG to "SSR", to match the linuxcnc hm2 driver
  7i96: make the connector list match the ioport list
  capitalize Ethernet consistently in --help message
  fix addr argument for ethernet boards in --help message
  consistent capitalization and punctuation in --help output
  fix formatting of --help output
  release 3.3.0~pre0+dfsg-0
  release mesaflash 3.2.1
  debian/changelog: new version
  pci_analog_write: include unistd.h, which declares usleep()
  sserial_module: declare sserial_write(), used by pci_analog_write
  pci_encoder_read: include unistd.h, for usleep()
  serial_boards: add some missing declarations
  spi_boards: include unistd.h
  spi_boards: include ctype.h
  add missing return value in spi_boards_init()
  spi_boards: include eeprom.h
  eeprom_local: include pci/pci.h
  hostmot2: add some missing function declarations
  pci_boards: move pci_read() and pci_write() to before the first use in the file
  pci_boards: include sys/time.h
  anyio: include missing serial_boards.h
  include bitfile.h in eeprom.c, for print_bitfile_header()
  function declarations shouldn't be marked inline

Fix -Wstringop-truncation warnings

Add sys/io.h stubs implementation

Fix linking errors

Fix compilation errors

Fix -Wformat warning

Make packaging easier

Fix misleading indentation warnings

Add GPL license text file

Allows mesaflash to be compiled on platforms (such as arm)
which do not provides <sys/io.h> header file.

Signed-off-by: Damian Wrobel <dwrobel@ertelnet.rybnik.pl>

Fixes the following warnings:
In function 'strncpy',
    inlined from 'spi_boards_scan' at spi_boards.c:203:9:
/usr/include/bits/string_fortified.h:106:10: warning: '__builtin_strncpy'
output truncated before terminating nul copying 4 bytes
from a string of the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));

In file included from /usr/include/string.h:495,
                 from pci_boards.c:34:
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1281:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1240:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1205:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1177:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1144:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1117:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1089:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1056:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:1026:21:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:995:17:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:967:17:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:940:17:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:912:17:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:885:17:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘pci_boards_scan’ at pci_boards.c:851:17:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 14 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In file included from /usr/include/string.h:495,
                 from usb_boards.c:21:
In function ‘strncpy’,
    inlined from ‘usb_boards_scan’ at usb_boards.c:188:9:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘usb_boards_scan’ at usb_boards.c:147:13:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’
output truncated before terminating nul copying 4 bytes from a string of
the same length [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:329:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:306:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:283:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:259:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:235:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:211:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:186:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘eth_scan_one_addr’ at eth_boards.c:161:13,
    inlined from ‘eth_scan_one_addr.isra.0’ at eth_boards.c:136:12:
/usr/include/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output
may be truncated copying 16 bytes from a string of length 19 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Damian Wrobel <dwrobel@ertelnet.rybnik.pl>

Fixes the following linking errors on gcc 10:
/usr/bin/ld: libanyio.a(spi_boards.o):spi_boards.c:41:
 multiple definition of `sd';
 libanyio.a(eth_boards.o):eth_boards.c:49: first defined here
/usr/bin/ld: libanyio.a(serial_boards.o):serial_boards.c:38:
 multiple definition of `sd';
 libanyio.a(eth_boards.o):eth_boards.c:49: first defined here
/usr/bin/ld: libanyio.a(lbp.o):mesaflash/lbp.c:31:
 multiple definition of `sd';
 libanyio.a(eth_boards.o):eth_boards.c:49: first defined here

Signed-off-by: Damian Wrobel <dwrobel@ertelnet.rybnik.pl>