Remove use of 'register' from QtXmlPatterns.

Change-Id: I7d5136b9381fcce1ac7233ac743ab205d73ca0fa
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I468ad5664b2c462812a0046d14024a19392f24db