QtIFW

QFileInfo(m_path).readLink(); can't read junctions

 - in older code there was a try to resolve junctions like symbolic links,
   but this broke many other code
 - we copied the read windows symlink code from the private qt file and
   made small adjustmenst to be able to call it directly in targetPath() method
 - and changed the isValid behaviour, because we want to create links to
   locations which are created later
 - and it is creating the path to the link on every OS

Change-Id: Id11839bbf2ecfde410982833d10f96d36fe1cab7
Reviewed-by: Alexander Lenhardt <alexander.lenhardt@nokia.com>