Match the input waiter callback signature

tests/test_etcp_windows.c

@@ -1045,7 +1045,8 @@ static void stalled_retry_selection(void) {
     teardown();
 }
 
-static void abort_input_admission(void* arg) {
+static void abort_input_admission(struct ll_queue* q, void* arg) {
+    (void)q;
     unsigned action = (unsigned)(uintptr_t)arg;
     if (action == 1) etcp_conn_reinit_id(conn, "input admission callback", conn->reset_id);
     else if (action == 2) etcp_connection_close(conn);