Add compat sched affinity code.  We can argue about how
USE_COMPAT_ULONG_CPUMASK works now that the non compat interface has
changed.

The old non compat behaviour was to require a bitmap long enough in both
setaffinity and getaffinity, now its only required in getaffinity.  I could
do the same for the 32bit interfaces.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>