[Bug 727746] Factor buffer flags-to-string code

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=727746
  GStreamer | gstreamer (core) | git

Vincent Penquerc'h <vincent.penquerch> changed:

           What    |Removed                     |Added
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             Status|NEEDINFO                    |NEW

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