Add ARCH_USER_CFLAGS so the arches can modify USER_CFLAGS.  We now take
__ARCH_WANT_OLD_STAT and __ARCH_WANT_STAT64 from the base arch so that the
LFS-64 code gets included or excluded automatically.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>