Fix build without optional QtQuick dependency
Fix build without optional QtQuick dependency

Change-Id: I167131bee44b53d4c5c34c57f3f8f389c5d998ed
Reviewed-by: Sergio Ahumada <27ca633ce817d1c3858ceeac3c99febb78411853@digia.com>

kobolabs/qtwinextras,kobolabs/qtwinextras