avoid unused parameter warnings

src/main.c

@@ -6,6 +6,7 @@ int main(int argc, char **argv) {
   struct tls_config *config;
   Connection connection;
 
+  (void) argc, (void) argv;
   tls_init();
   config = tls_config_new();
   connection_init(EV_DEFAULT_ & connection, config);

src/network.c

@@ -26,6 +26,7 @@ struct Buffer {
 #endif
 
 void connection_init(EV_P_ Connection *connection, struct tls_config *config) {
+  (void)(EV_A_ 0);
   ev_io_init(&connection->watcher, NULL, STDIN_FILENO, 0);
   connection->ctx = tls_client();
   tls_configure(connection->ctx, config);