Path to Qt not added anymore for custom executable

When debugging a project of a dll using Qt loaded by an external application, the "Custom Executable" is used to Run configuration of the project. Until now, in this case, the path to Qt is automatically added to the path environment variable when debugging. This seems not to be the case with Qt Creator 4.5.0. This is still the case when debugging a Qt application but no more when starting a "Custom executable". Since the dll need to load Qt libraries you need to modify the environment manually on all projects to be able to debug.