add missing return statement (#1335)

I had to fix this, because my linker was complaining

examples/common/entry/entry_noop.cpp

@@ -71,7 +71,7 @@ namespace entry
 
 int main(int _argc, const char* const* _argv)
 {
-	entry::main(_argc, _argv);
+	return entry::main(_argc, _argv);
 }
 
 #endif // ENTRY_CONFIG_USE_NOOP