[Bug 781320] adaptivedemux: Don't hold locks when pushing FLUSH_START

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781320

--- Comment #2 from Edward Hervey <bilboed at bilboed.com> ---
The problem is that:
1) The QOS handling in adaptivedemux takes the MANIFEST LOCK
  That QOS event comes from basesink with its PREROLL_LOCK taken
2) FLUSH_START is sent from adaptivedemux with the MANIFEST_LOCK taken and the
basesink flushing handler needs to take the PREROLL_LOCK

 => deadlock

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