Fix: App used old threading interface.

app/test_for_new/main.cpp

@@ -7,6 +7,6 @@ int global = 0;
 
 int main() {
   // Try to use every feature, to trigger the prohibited use of new if found somewhere
-  auto t1 = start_thread([]() {});
+  thread t1{[]() {}};
   t1.join();
 }