src/shared/util.c includes <sys/capability.h> but doesn't use anything
defined there. Since <sys/capability.h> is part of libcap, not libc,
don't require it.
Allows systemd-without-udevd to require fewer external libraries.
#include <linux/kd.h>
#include <dlfcn.h>
#include <sys/wait.h>
#include <linux/kd.h>
#include <dlfcn.h>
#include <sys/wait.h>
-#include <sys/capability.h>
#include <sys/time.h>
#include <glob.h>
#include <grp.h>
#include <sys/time.h>
#include <glob.h>
#include <grp.h>