Move gdb-dlfcn.[ch] to gdbsupport/

I need to use 'gdb_dlopen' inside 'gdbsupport/', but it's not yet
supported there.  This commit moves 'gdb-dlfcn.[ch]' to 'gdbsupport/',
which makes it available also on gdbserver.

gdb/ChangeLog:
2019-08-23  Sergio Durigan Junior  <sergiodj@redhat.com>

	* configure.ac: Don't check for 'dlfcn.h' (moved to
	gdbsupport/common.m4).
	* Makefile.in (COMMON_SFILES): Move 'gdb-dlfcn.c' to
	'gdbsupport/'.
	(HFILES_NO_SRCDIR): Likewise, for 'gdb-dlfcn.h'.
	* compile/compile-c-support.c: Include
	'gdbsupport/gdb-dlfcn.h'.
	* gdbsupport/common.m4: Check for 'dlfcn.h'.
	* gdb-dlfcn.c: Move to...
	* gdbsupport/gdb-dlfcn.c: ... here.
	* gdb-dlfcn.h: Move to...
	* gdbsupport/gdb-dlfcn.h: ... here.

gdb/gdbserver/ChangeLog:
2019-08-23  Sergio Durigan Junior  <sergiodj@redhat.com>

	* Makefile.in (SFILES): Add 'gdbsupport/gdb-dlfcn.c'.
	(OBS): Add 'gdbsupport/gdb-dlfcn.o'.
	* config.in: Regenerate.
	* configure: Regenerate.

1 files changed, 0 insertions, 51 deletions

diff --git a/gdb/gdb-dlfcn.h b/gdb/gdb-dlfcn.h
deleted file mode 100644
index 6a39d38..0000000
--- a/gdb/gdb-dlfcn.h
+++ /dev/null
@@ -1,51 +0,0 @@
-/* Platform independent shared object routines for GDB.
-
-   Copyright (C) 2011-2019 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#ifndef GDB_DLFCN_H
-#define GDB_DLFCN_H
-
-/* A deleter that closes an open dynamic library.  */
-
-struct dlclose_deleter
-{
-  void operator() (void *handle) const;
-};
-
-/* A unique pointer that points to a dynamic library.  */
-
-typedef std::unique_ptr<void, dlclose_deleter> gdb_dlhandle_up;
-
-/* Load the dynamic library file named FILENAME, and return a handle
-   for that dynamic library.  Return NULL if the loading fails for any
-   reason.  */
-
-gdb_dlhandle_up gdb_dlopen (const char *filename);
-
-/* Return the address of the symbol named SYMBOL inside the shared
-   library whose handle is HANDLE.  Return NULL when the symbol could
-   not be found.  */
-
-void *gdb_dlsym (const gdb_dlhandle_up &handle, const char *symbol);
-
-/* Return non-zero if the dynamic library functions are available on
-   this platform.  */
-
-int is_dl_available(void);
-
-#endif /* GDB_DLFCN_H */