Qt5: patches for linuxfb only systems

Merged patches from the official qtbase/stable branch,
not part of 5.2.1.

Signed-off-by: Peter Kümmel <syntheticpp@gmx.net>
Acked-by: Fatih Aşıcı <fatih.asici@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>