QGeoPositionInfo timestamp not correctly set (WinRT)

The WinRT implementation sets the QGeoPositionInfo timestamp using the current system time:

currentInfo.setTimestamp(QDateTime::currentDateTime());

Instead the timestamp from the location info (https://msdn.microsoft.com/en-us/library/windows/apps/windows.devices.geolocation.geocoordinate.timestamp.aspx) should be used because the location info must not necessarily correspond to the local system time.