Remove code related to dead or currently unsupported platforms

- Removes the Meego/Maemo backend for QtNfc
- Remove Simulator, WinCE and S60 remnants from the examples

If any of these platforms becomes relevant they can be added back
of course.

Change-Id: I84712ea07f01794b622560ce77e08cee347406e3
Reviewed-by: Michael Zanetti <michael.zanetti@canonical.com>
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Reviewed-by: Alex <alexander.blasche@digia.com>