the qsdbg example needs no QtGui

Task-number: QTBUG-36893
Change-Id: I4199df78e037c3959fd7d745d89b59d667010b73
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I318396444325b8afc3d5fbd1202a463b61fb15fb