Python kits get a Qt version

Starting QC with clean settings and with qmake in PATH will create the default kit including Qt, Compiler, Debugger (and cmake if present)

If you have Python in PATH as well it also creates a Python kit - but this will also have Qt configured which is neither expected nor useful.

The python kit a such should only contain Python relevant aspects.

This also may lead to issues for users, e.g. deleting all "normal" kits (possible if you have no auto detected) will end up on the Project view on the target setup page and the Python kit will be usable (if it's a e.g. a qmake or qbs based project)

Found by Squish test tst_remove_kits.