gst/gstpipeline.c: Modify the clock distribution path in PAUSED->PLAYING so that...

gst/gstpipeline.c: Modify the clock distribution path in PAUSED->PLAYING so that we never attempt to choose a new clo...

Original commit message from CVS:
* gst/gstpipeline.c: (gst_pipeline_change_state):
Modify the clock distribution path in PAUSED->PLAYING so that we
never attempt to choose a new clock unless we're actually leaving
the PAUSED state for the first time. This prevents choosing a
different clock when the state_change gets called for a 2nd time due
to some element doing an async state change.