Binutils/GCC: Add clang LTO support to AR, NM and RANLIB

Add CLANG_PLUGIN_FILE to find the clang plugin file and pass it to
--plugin for ar, nm and ranlib so that binutils can be built with
clang LTO.  Run CLANG_PLUGIN_FILE before GCC_PLUGIN_OPTION since
GCC_PLUGIN_OPTION may return the wrong PLUGIN_OPTION with clang.

	PR binutils/33470
	* Makefile.in: Regenerated.
	* Makefile.tpl (NM): Add @NM_PLUGIN_OPTION@.
	* configure: Regenerated.
	* configure.ac: Include config/clang-plugin.m4.
	Run CLANG_PLUGIN_FILE before GCC_PLUGIN_OPTION to set
	PLUGIN_OPTION.  Set and subst NM_PLUGIN_OPTION.
	* libtool.m4 (_LT_CMD_OLD_ARCHIVE): Use CLANG_PLUGIN_FILE and
	GCC_PLUGIN_OPTION.

config/

	PR binutils/33470
	* clang-plugin.m4: New file.

libbacktrace/

	PR binutils/33470
	* Makefile.in: Regenerated.
	* aclocal.m4: Likewise.
	* configure: Likewise.

libiberty/

	PR binutils/33470
	* aclocal.m4: Regenerated.
	* configure: Likewise.
	* configure.ac: Move GCC_PLUGIN_OPTION after GCC_NO_EXECUTABLES.
	Run CLANG_PLUGIN_FILE before GCC_PLUGIN_OPTION to set
	PLUGIN_OPTION.  Don't add the redundant --plugin option.

zlib/

	PR binutils/33470
	* Makefile.in: Regenerated.
	* aclocal.m4: Likewise.
	* configure: Likewise.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>