PR tree-optimization/36218
	* Makefile.def (flags_to_pass): Add LDFLAGS_FOR_BUILD.
	* Makefile.tpl (EXTRA_BUILD_FLAGS): Define.
	(all prefix="build-"): Pass them to build-system sub-makes.
	* Makefile.in: Regenerate.

config:
	* config/mh-mingw (LDFLAGS): Define.

gcc:
	* configure.ac: Use LDFLAGS="${LDFLAGS_FOR_BUILD}" when running
	configure for the build system.
	(BUILD_LDFLAGS): Define.
	* configure: Regenerate.
	* Makefile.in (BUILD_LDFLAGS): Define to @BUILD_LDFLAGS@.

From-SVN: r136563