[Bug 740753] vaapisink: add support for EGL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=740753

--- Comment #7 from Daniel van Vugt <daniel.van.vugt at canonical.com> ---
Created attachment 356704
  --> https://bugzilla.gnome.org/attachment.cgi?id=356704&action=edit
Third working prototype

This version removes the possibility of buffer overruns. Instead of guessing
that it's OK to overestimate the buffer size, we now get the actual GEM buffer
size via ioctl. A new guess is required after that still to work around an i965
driver bug, but the new one only rounds down so won't ever cause an overrun.

It's still not pretty. We don't have a decisive way to determine the correct
DRM fd to use. But this version is safer.

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