Fix Solaris bootstrap with GNU ld/LTO

	* configure.ac (ac_lto_plugin_ldflags): Set to -Wc,-static-libgcc
	for gcc.
	* configure: Regenerate.
	* Makefile.am (AM_LDFLAGS): New variable.
	(liblto_plugin_la_LDFLAGS): Add it.
	* Makefile.in: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@208614 138bc75d-0d04-0410-961f-82ee72b054a4