fix warning: add missing prototype

apps/ts.c

@@ -118,6 +118,7 @@ static X509_STORE *create_cert_store(char *ca_path, char *ca_file);
 static int MS_CALLBACK verify_cb(int ok, X509_STORE_CTX *ctx);
 
 /* Main function definition. */
+int MAIN(int, char **);
 
 int MAIN(int argc, char **argv)
 	{