QtTools: Remove reference to deprecated Q_EXPORT_PLUGIN2
QtTools: Remove reference to deprecated Q_EXPORT_PLUGIN2

Change-Id: Ic553855393b23c8d1817e40bdff7bd219c395caf
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@digia.com>

mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools