* add Desktop as available target in __chooseTargets__()
* do shadow builds for Desktop targets in openQmakeProject()

This patch makes https://codereview.qt-project.org/#change,28038


pass for me on Linux as well.

Change-Id: I3a4395a401198756e6a7d6a38c0b024167088dc3
Reviewed-by: Robert Löhning <robert.loehning@nokia.com>