Add QContactMaemo5Engine::performAsynchronousOperation() implementation (cherry picked from commit 153a323cd967215948fe614ca4a2084254b11c67)
Add QContactMaemo5Engine::performAsynchronousOperation() implementation
(cherry picked from commit 153a323cd967215948fe614ca4a2084254b11c67)

Relates to QTMOBILITY-135

qtproject/qt-mobility,tmcguire/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,qtproject/qt-mobility,KDE/android-qt-mobility,KDE/android-qt-mobility,tmcguire/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,kaltsi/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,KDE/android-qt-mobility,qtproject/qt-mobility,kaltsi/qt-mobility,KDE/android-qt-mobility