mkheaders.in (incdir): Use include-fixed not include.

mkheaders.in (incdir): Use include-fixed not include.

fixincludes:
	* mkheaders.in (incdir): Use include-fixed not include.

gcc:
	* Makefile.in (PREPROCESSOR_DEFINES, test-protoize-simple): Define
	FIXED_INCLUDE_DIR.
	(stmp-int-hdrs, stmp-fixinc, install-headers): Use include-fixed
	for fixed headers and limits.h.
	(install-include-dir, install-headers-tar, install-headers-cpio,
	install-headers-cp, real-install-headers-tar,
	real-install-headers-cpio, real-install-headers-cp): Handle
	include-fixed as well as include.
	(install-mkheaders): Don't install files that go only in include
	not include-fixed.
	* cppdefault.c (cpp_include_defaults): Separate FIXED_INCLUDE_DIR
	from GCC_INCLUDE_DIR.
	* gcc.c (process_command): Remove special -BstageN/ handling.
	(do_spec_1): Add include-fixed directories.

From-SVN: r122384