Make platformsupport depend on platformheaders

Change-Id: Iad70e27d35ac7a3e4c74bc15826536b003cadba4
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Don't repeat Tab names in the QTabBar

Task-number: QTBUG-38503
Change-Id: I1f7e599b46526a8c4b8e0f3534be9c717727a4aa
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>