[Bug 733921] basesrc: re-negotiate caps in pull mode if necessary

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733921
  GStreamer | gstreamer (core) | git master

--- Comment #2 from Matthieu Bouron <matthieu.bouron at collabora.com> 2015-02-03 11:46:44 UTC ---
The issue can be triggered by implementing a fake propose_allocation method to
fakesink and the following pipeline:

filesrc location=[...] ! typefind ! fakesink

The attached patch let filesrc negotiate and call the query allocation.

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