root_plug: use cap_task_prctl

With the introduction of per-process securebits, the capabilities-related
prctl callbacks were moved into cap_task_prctl().  Have root_plug use
cap_task_prctl() so that PR_SET_KEEPCAPS is defined.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

security/root_plug.c

@@ -86,6 +86,7 @@ static struct security_operations rootplug_security_ops = {
 
 	.task_post_setuid =		cap_task_post_setuid,
 	.task_reparent_to_init =	cap_task_reparent_to_init,
+	.task_prctl =			cap_task_prctl,
 
 	.bprm_check_security =		rootplug_bprm_check_security,
 };