Squish: Remove Qt4 compatibility code

Thank you Qt4 for all the good times we had together.
Farewell.

Change-Id: If0e81b71a97524bb0c84ea5bbcba4c29244a0a5e
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Squish: Expect missing manual

Change-Id: I296d492ea79512ac73dfec4d86743b1203ee9631
Reviewed-by: Christian Stenger <christian.stenger@digia.com>