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/bsslap/bsslap_test.c b/tests/bsslap/bsslap_test.c
index f20f7db..fc5ce75 100644
--- a/tests/bsslap/bsslap_test.c
+++ b/tests/bsslap/bsslap_test.c
@@ -48,7 +48,7 @@
 	},
 };
 
-void test_bsslap_enc_dec()
+void test_bsslap_enc_dec(void)
 {
 	struct bsslap_pdu *pdu;
 	printf("--- %s\n", __func__);
@@ -96,7 +96,7 @@
 	}
 }
 
-int main()
+int main(int argc, char **argv)
 {
 	test_bsslap_enc_dec();
 	return 0;