[Bug 782552] glmemory: remove use of glDrawBuffer in tex_copy

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782552

--- Comment #3 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Sebastian Dröge (slomo) from comment #2)
> Why is it not necessary? This is solved in bug #782376 already though, but
> if it's unnecessary we should remove the call completely.

Your solution is better, because we should make sure the gl state is right when
call biltframebuffer which the draw buffer must be GL_COLOR_ATTACHMENT0.

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