qt5declarative: backport 'Fix alignment issue on ARMv7' patch to 5.9.1

This resolves a QML issues reported in
https://bugreports.qt.io/browse/QTBUG-61522

 that will be fixed in the
5.9.2.

Signed-off-by: Petar Koretic <petar.koretic@qaap.io>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>