* Makefile.in: Regenerate.
	* Makefile.def (gcc host module) and soft dependency on lto-plugin
	and configure dependency on lto-plugin configure.
	(lto-plugin module): Remove dependency on GCC; add dependency on
	liniberty.

	* doc/invoke.texi: (-flto, -fuse-linker-plugin): Update defaults
	and no longer claim that gold is required for linker plugin.
	* configure: Regenerate.
	* gcc.c (PLUGIN_COND): New macro.
	(LINK_COMMAND_SPEC): Use it.
	(main): Default to plugin enabled with HAVE_LTO_PLUGIN is set.
	* config.in (HAVE_LTO_PLUGIN): New.
	* configure.ac (--with-lto-plugin): New parameter; autodetect
	HAVE_LTO_PLUGIN.

From-SVN: r168593