[Bug 754680] fix support for EGL through GstVideoGLTextureUploadMeta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754680

--- Comment #44 from Hyunjun Ko <zzoon at igalia.com> ---
I'm proposing new patch based on master.

Note that patches from 2 to 9 should be together to build successfully.
I just spilited those to review easier.

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