[Bug 788503] fix the check for dmabuf handling in downstream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788503

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 360897
  --> https://bugzilla.gnome.org/attachment.cgi?id=360897&action=edit
plugins: add gst_vaapi_plugin_base_set_srcpad_can_dmabuf()

This patch refactors the code by adding the function
vaapi_plugin_base_set_srcpad_can_dmabuf(), it determines if the passed
GstGLContext can handle dmabuf-based buffers.

The function is exposed publicly since it is intended to be used later
at GstVaapiDisplay instantiation.

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