Running 'make distclean' should remove all files generated by qmake,
including .qmake.stash/super. These files are considered owned by
a particular project (and hence a candidate for distclean), if it
lives in the same directory as the output dir of the project.
Task-number: QTBUG-42678
Change-Id: I224e9bac039eeacb6561e18acc7f8e867da5dab8
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>