tests: get rid of HAVE_SECCOMP nonsense

Because of the #undef (probably left over from some debugging I did that
accidentally got committed), this test never ran. Anyway, this is all
unnecessary because we can just use the seccomp_filter feature flag in the
tests.

Also reenable the seccomp_filter_tsync test.
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm/live/static/seccomp_filter_tsync.c

@@ -15,15 +15,6 @@
 #include <pthread.h>
 #include "zdtmtst.h"
 
-#undef __NR_seccomp
-
-#ifdef __NR_seccomp
-#define HAVE_SECCOMP 1
-#else
-#define HAVE_SECCOMP 0
-#define __NR_seccomp -1
-#endif
-
 #ifndef SECCOMP_SET_MODE_FILTER
 #define SECCOMP_SET_MODE_FILTER 1
 #endif
@@ -106,11 +97,6 @@ int main(int argc, char ** argv)
 
 	test_init(argc, argv);
 
-	if (!HAVE_SECCOMP) {
-		skip("no seccomp present in this kernel\n");
-		return 0;
-	}
-
 	if (socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair)) {
 		pr_perror("socketpair");
 		return -1;

test/zdtm/live/static/seccomp_filter_tsync.desc

-{'flags': 'suid noauto', 'feature': 'seccomp_filters'}
+{'flags': 'suid', 'feature': 'seccomp_filters'}