capabilities: remove __cap_full_set definition

In 5163b583 I removed __cap_full_set but
forgot to remove it from a header.  Do that.
Reported-by: Kornilios Kourtis <kkourt@cslab.ece.ntua.gr>
Signed-off-by: Eric Paris <eparis@redhat.com>

include/linux/capability.h

@@ -379,7 +379,6 @@ struct user_namespace;
 struct user_namespace *current_user_ns(void);
 
 extern const kernel_cap_t __cap_empty_set;
-extern const kernel_cap_t __cap_full_set;
 extern const kernel_cap_t __cap_init_eff_set;
 
 /*