[PATCH] Fix noise in futex.h

There are some kernel-only bits in the middle of <linux/futex.h> which
should be removed in what we export to userspace.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>