gst1: Avoid using pipeline.get_clock()
gst1: Avoid using pipeline.get_clock()

Often the clock isn't available for use. gst_pipeline_clock() which is
always available requires Gst 1.6.

mokieyue/mopidy,adamcik/mopidy,tkem/mopidy,mopidy/mopidy,mopidy/mopidy,jodal/mopidy,mokieyue/mopidy,kingosticks/mopidy,jcass77/mopidy,vrs01/mopidy,jcass77/mopidy,mokieyue/mopidy,jcass77/mopidy,ZenithDK/mopidy,ZenithDK/mopidy,vrs01/mopidy,jodal/mopidy,ZenithDK/mopidy,vrs01/mopidy,mokieyue/mopidy,adamcik/mopidy,kingosticks/mopidy,kingosticks/mopidy,adamcik/mopidy,jodal/mopidy,tkem/mopidy,tkem/mopidy,mopidy/mopidy,vrs01/mopidy,ZenithDK/mopidy,tkem/mopidy