- copy some more code from kdelibs to get the correct linker flags - enable backend subdirs
- copy some more code from kdelibs to get the correct linker flags
- enable backend subdirs

KDE/phonon-xine,KDE/phonon-directshow,shadeslayer/phonon-gstreamer,KDE/phonon-waveout,KDE/phonon-gstreamer,KDE/phonon-directshow,shadeslayer/phonon-gstreamer,KDE/phonon-xine,KDE/phonon-quicktime,KDE/phonon-gstreamer,shadeslayer/phonon-gstreamer,KDE/phonon-mmf,KDE/phonon-xine