zdtm: don't include linux/seccomp.h

linux/seccomp.h doesn't use in the different_creds test.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/different_creds.c

@@ -5,7 +5,6 @@
 #include <signal.h>
 #include <sched.h>
 #include <sys/capability.h>
-#include <linux/seccomp.h>
 #include <linux/limits.h>
 
 #include "zdtmtst.h"