[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755072

--- Comment #63 from Julien Isorce <julien.isorce at gmail.com> ---
About #59, instead of using gst_memory_map I realized that I should try to use
fstat instead, to check the mode of the dmabuf fd. But it is always marked as
writable (st_mode has S_IWUSR flag) for both case: mmap fail, mmap succeeds.
So I confirm that we cannot use fstat.

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