directfb: Add upstream patch to fix qt5base build

Fixes http://autobuild.buildroot.net/results/8c7eaf99e365ecff28c097475b235dbe8d614294/

Signed-off-by: Fatih Aşıcı <fatih.asici@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>