Support building with -Werror=strict-prototypes / -Werror=old-style-definition

Unfortunately "-std=c99" is not sufficient to make gcc ignore code that
uses constructs of earlier C standards, which were abandoned in C99.

See https://lwn.net/ml/fedora-devel/Y1kvF35WozzGBpc8@redhat.com/ for
some related discussion.

Change-Id: I84fd99442d0cc400fa562fa33623c142649230e2
diff --git a/tests/time_cc/time_cc_test.c b/tests/time_cc/time_cc_test.c
index 22ea7f6..e4a5aaf 100644
--- a/tests/time_cc/time_cc_test.c
+++ b/tests/time_cc/time_cc_test.c
@@ -125,7 +125,7 @@
 	.num_cat = ARRAY_SIZE(log_categories),
 };
 
-int main()
+int main(int argc, char **argv)
 {
 	void *ctx = talloc_named_const(NULL, 0, "time_cc_test");
 	struct timespec *now;