* build-make, cross-make: Delete file.
	* configure.in: Set and substitute CROSS, ALL,
	SYSTEM_HEADER_DIR, HOST_PREFIX, HOST_PREFIX_1, HOST_CC,
	HOST_CFLAGS, STMP_FIXINC, and STMP_FIXPROTO depending on
	whether build == host and host == target.  Do not
	AC_SUBST_FILE build_overrides or cross_overrides.  Do not
	AC_SUBST cross_defines or extra_c_flags.
	* Makefile.in (NATIVE_SYSTEM_HEADER_DIR): New.
	(SYSTEM_HEADER_DIR, HOST_PREFIX, HOST_CC, HOST_PREFIX,
	HOST_PREFIX_1, HOST_CFLAGS, ALL, INTERNAL_CFLAGS): Set
	partially or completely with autoconf-substituted @variable@
	notation.
	(INSTALL_TARGET, @cross_defines@, @cross_overrides@,
	@build_overrides@, @extra_c_flags@, all.build, install-build,
	install-cross-rest, install-float-h-cross): Deleted.
	(install-normal): Rename to install.  Delete old "install"
	indirection rule.
	* ada/Makefile.in, ch/Makefile.in: Don't set ALL.  Delete
	@cross_defines@, @cross_overrides@, @build_overrides@ stanzas.
	INTERNAL_CFLAGS is now @CROSS@ -DIN_GCC; update comment.

From-SVN: r47617