Linking to Qt makes the respective configured kits become
auto detected and these have a fixed Qt.
The Qt version combo box for these kits is disabled on the
Kits page, so be more relaxed when checking kits page.
Change-Id: Ieb7e22b47bd5e5c5603e85dc0ddf2421427e85d6
Reviewed-by: Robert Löhning <robert.loehning@qt.io>