* configure.in: Allow explicit specification of CFLAGS_FOR_BUILD.

	* configure: Rebuilt
	* Makefile.tpl: Use CFLAGS_FOR_BUILD computed by configure
	* Makefile.in: Rebuilt


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@72130 138bc75d-0d04-0410-961f-82ee72b054a4