Remove private API use from video orientation handler

The QPA header isn't needed anymore, as nativeOrientation was added as
a QScreen property in 5.2.

Change-Id: I7cd00feae769175fd0c4be65b503e74ee910814a
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>
Make it compile with no-opengl

Change-Id: I71358bb1268e5b28b66b1817a3ec0cd98459cfd2
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>