Sync zlib sources with GCC, upgrading to 1.2.10.

Changes in 1.2.10 (2 Jan 2017)
- Avoid warnings on snprintf() return value
- Fix bug in deflate_stored() for zero-length input
- Fix bug in gzwrite.c that produced corrupt gzip files
- Remove files to be installed before copying them in Makefile.in
- Add warnings when compiling with assembler code

Changes in 1.2.9 (31 Dec 2016)
- Fix contrib/minizip to permit unzipping with desktop API [Zouzou]
- Improve contrib/blast to return unused bytes
- Assure that gzoffset() is correct when appending
- Improve compress() and uncompress() to support large lengths
- Fix bug in test/example.c where error code not saved
- Remedy Coverity warning [Randers-Pehrson]
- Improve speed of gzprintf() in transparent mode
- Fix inflateInit2() bug when windowBits is 16 or 32
- Change DEBUG macro to ZLIB_DEBUG
- Avoid uninitialized access by gzclose_w()
- Allow building zlib outside of the source directory
- Fix bug that accepted invalid zlib header when windowBits is zero
- Fix gzseek() problem on MinGW due to buggy _lseeki64 there
- Loop on write() calls in gzwrite.c in case of non-blocking I/O
- Add --warn (-w) option to ./configure for more compiler warnings
- Reject a window size of 256 bytes if not using the zlib wrapper
- Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
- Add --debug (-d) option to ./configure to define ZLIB_DEBUG
- Fix bugs in creating a very large gzip header
- Add uncompress2() function, which returns the input size used
- Assure that deflateParams() will not switch functions mid-block
- Dramatically speed up deflation for level 0 (storing)
- Add gzfread(), duplicating the interface of fread()
- Add gzfwrite(), duplicating the interface of fwrite()
- Add deflateGetDictionary() function
- Use snprintf() for later versions of Microsoft C
- Fix *Init macros to use z_ prefix when requested
- Replace as400 with os400 for OS/400 support [Monnerat]
- Add crc32_z() and adler32_z() functions with size_t lengths
- Update Visual Studio project files [AraHaan]

1 files changed, 2 insertions, 2 deletions

diff --git a/zlib/examples/gzlog.c b/zlib/examples/gzlog.c
index 922f878..b8c2927 100644
--- a/zlib/examples/gzlog.c
+++ b/zlib/examples/gzlog.c
@@ -1,6 +1,6 @@
 /*
  * gzlog.c
- * Copyright (C) 2004, 2008, 2012 Mark Adler, all rights reserved
+ * Copyright (C) 2004, 2008, 2012, 2016 Mark Adler, all rights reserved
  * For conditions of distribution and use, see copyright notice in gzlog.h
  * version 2.2, 14 Aug 2012
  */
@@ -243,7 +243,7 @@ typedef unsigned int uint;
 typedef unsigned long ulong;
 
 /* Macro for debugging to deterministically force recovery operations */
-#ifdef DEBUG
+#ifdef GZLOG_DEBUG
     #include <setjmp.h>         /* longjmp */
     jmp_buf gzlog_jump;         /* where to go back to */
     int gzlog_bail = 0;         /* which point to bail at (1..8) */