[Bug 703659] allocators: dmabuf: allow testing allocator type

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703659
  GStreamer | gst-plugins-base | 1.x

--- Comment #4 from Benjamin Gaignard <benjamin.gaignard at gmail.com> 2013-07-08 16:47:52 UTC ---
For me it is exactly like the function gst_is_dmabuf_memory above it return
false if dmabuf isn't implemented.

I would like avoid propagate compilation everywhere: for example in v4l2src it
should help us to know if we can use dmabuf ioctl or not.

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