Add THREADS_ENABLED macro in order to compile Godot to run on the main thread

core/os/os.cpp

@@ -504,6 +504,12 @@ bool OS::has_feature(const String &p_feature) {
 	}
 #endif
 
+#ifdef THREADS_ENABLED
+	if (p_feature == "threads") {
+		return true;
+	}
+#endif
+
 	if (_check_internal_feature_support(p_feature)) {
 		return true;
 	}