QML_IMPORT_PATH issue

The qmake variable QML_IMPORT_PATH seems to be sensitive to the order in which arguments are listed, and this is causing Qt Creator to throw incorrect syntax/missing import errors when two modules share similar path parts.

I've attached an example project in this folder. It contains three folders:

• import1, which contains the QML Foo.Bar module.
• import2, which contains the QML Foo.Bar.Toolkit module.
• simple_project, which is an empty QML project that imports both modules.

Importantly, the project builds and runs. There are no issues with the project itself; this is a Qt creator issue.
If you open up the project in QtCreator and navigate to `main.qml`, you'll notice that while "Foo.Bar.Toolkit" imports, there is an issue importing "Foo.Bar" (as seen in screenshot failure_1.png).

This seems to be caused by line 21 in `simple_project.pro` where the order of arguments is:

1. Additional import path used to resolve QML modules in Qt Creator's code model
   QML_IMPORT_PATH += \
   $$clean_path($$PWD/../import2) \
   $$clean_path($$PWD/../import1)
   ```
   If the order of folders `import1` and `import2` are reversed, the import system works, but in the current order of arguments exhibits this QtCreator bug.