Move capable() to kernel/capability.c and eliminate duplicate
implementations.  Add __capable() function which can be used to check for
capabiilty of any process.
Signed-off-by: NChris Wright <chrisw@sous-sol.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>