Revision 1078226

xine: Always ensure we create the correct xine port for audio output.

When integrating with pulseaudio it was possible that the port was not correctly created.
This could happen if phonon was started and the first device detected from PA was a capture device
rather than a playback device (which is unlikely) or if the first device detected
was a removable audio device which was subsequently removed before playback started.

There are possibly other cases where this could happen too.
In this case xine would create a null port.

This change reverts a previous 'fix' committed in r1051721. I now issue a special case
for dealing with PA support in the createPort() method. As a result I no longer need
to special case handle the audioDriverFor() method of the backend so this is
now removed.

CCBUG: 223662