Can't correctly switch Kit after running CMake

1. Have two kits configured: one using Qt 4 and one using Qt 5.
2. Open CMakeLists.txt from SpeedCrunch's source package and proceed to the "Run CMake" page of the wizard.
3. Select the kit using Qt 5 and click "Run CMake".
   This fails because SpeedCrunch is not compatible with Qt 5. The log will contain a message like:

   Found unsuitable Qt version "5.5.0"
   

4. Select the kit using Qt 4 and click "Run CMake".
   This will fail, too. Again you'll see a message like:

   Found unsuitable Qt version "5.5.0"
   

   This shows that switching the kit didn't work correctly.

Running CMake with Qt 4 should succeed. If you don't try Qt 5 first, this works correctly.