Porting r1086506 to 4.4.0 tag

As in the subject. The commit above (r1086506) is critical for KAuth + polkit-
qt-1 to work, and it should be ported to 4.4.0 tag before release. See the 
commit log message.

Thanks,
--

-- 
-------------------

Dario Freddi
KDE Developer
GPG Key Signature: 511A9A3B