Make sure that the MEEGO_EDITION_HARMATTAN define is actually
picked up for harmattan (it's defined in qplatformdefs.h)

Change-Id: I3a0710992b5fa3e081821a66e32ed4a73eb5dd6e
Reviewed-on: http://codereview.qt.nokia.com/3595


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@nokia.com>
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>