selftests/bpf: Mark SYN cookie test skipped for UDP sockets

SYN cookie test with reuseport BPF doesn't make sense for UDP sockets. We
don't run it but the test_progs test runner doesn't know about it. Mark the
test as skipped so the test_progs can report correctly how many tests were
skipped.

Fixes: 7ee0d4e97b88 ("selftests/bpf: Switch reuseport tests for test_progs framework")
Reported-by: Lorenz Bauer <[e-mail]>
Signed-off-by: Jakub Sitnicki <[e-mail]>
Signed-off-by: Daniel Borkmann <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

tools/testing/selftests/bpf/prog_tests/select_reuseport.c

···
 		.pass_on_failure = 0,
 	};
 
-	if (type != SOCK_STREAM)
+	if (type != SOCK_STREAM) {
+		test__skip();
 		return;
+	}
 
 	/*
 	 * +1 for TCP-SYN and