[Bug 745287] basesink: drain query doesn't fully work to release v4l2 buffers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745287

--- Comment #4 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 298119
  --> https://bugzilla.gnome.org/attachment.cgi?id=298119&action=edit
gstbuffer: add gst_buffer_copy_deep

A variant of gst_buffer_copy that forces the underlying memory
to be copied.

This is added to avoid adding an extra reference to a GstMemory
that might belong to a bufferpool that is trying to be drained.
The use case is when the buffer copying is done to release the
old buffer and all its resources.

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