install.texi (Prerequisites): Mention GNU make requirement.

	* doc/install.texi (Prerequisites): Mention GNU make requirement.

	* Makefile.in (AR_FOR_TARGET): Export it.
	(AR_CREATE_FOR_TARGET): Likewise.
	(AR_FLAGS_FOR_TARGET): Likewise.
	(AR_EXTRACT_FOR_TARGET): Likewise.
	(AWK): Likewise.
	(BUILD_PREFIX): Likewise.
	(BUILD_PREFIX_1): Likewise.
	(DESTDIR): Likewise.
	(GCC_FOR_TARGET): Likewise.
	(INCLUDES): Likewise.
	(INSTALL_DATA): Likewise.
	(LIB1ASMSRC): Likewise.
	(LIBGCC2_CFLAGS): Likewise.
	(MACHMODE_H): Likewise.
	(NM_FOR_TARGET): Likewise.
	(RANLIB_FOR_TARGET): Likewise.
	(libsubdir): Likewise.
	(slibdir): Likewise.
	(ORDINARY_FLAGS_TO_PASS): Remove stuff that we're
	exporting.
	(libgcc.a): Don't pass them here.
	(stmp-multilib): Or here.
	(install-libgcc): Or here.
	(install-multilib): Or here.
	(POSTSTAGE1_FLAGS_TO_PASS): Or here.
	(stage1_build): Or here.

From-SVN: r70817