Make sure we build the MMF audio source when there is no openmax.
Make sure we build the MMF audio source when there is no openmax.

The logic meant that if there was no decision on the openmax plugin it
would not build this part of MMF.

Task-number: MOBILITY-2594 and friends
Reviewed-by: Ling Hu

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