moc: Avoid non-deterministic output which may result in unnecesary rebuilds

Change-Id: I4fdd2b37869ed73ede3a33b5adad94413bd43b01
qdbusxml2cpp: Use the mtime on the input XML to avoid needless source changes.

These can cause rebuilds unnecessarily when repeatedly running qdbusxml2cpp.

Change-Id: I902954d4bed6fe68802183e51d82700fe30af437
Mouse scaling support via QT_QPA_EVDEV_MOUSE_PARAMETERS