QtIFW

Fix freeze after rejecting UAC account (check GetLastError()).

Fixes too the case with runing a shared build. Since the
environment is not shared, we would not be able to load
missing libs, thus failing to start the server and endless
loop the wait for the servers connection.

Change-Id: If4c50783eb86488b3c2e0a92357750d9c17e7750
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>