[Bug 767979] GstBufferPool: acquire_buffer has unsafe GstPoll usage

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767979

--- Comment #2 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 330573
  --> https://bugzilla.gnome.org/attachment.cgi?id=330573&action=edit
bufferpool: Fix handling of the GstPoll

Especially if multiple threads are waiting for buffers to be available again,
the current code was wrong. Fix this and document clearly how the GstPoll is
supposed to be used.

Also fix some potential races with reading from the GstPoll before writing
actually happened.

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