vrend: Enable GL_DEBUG_OUTPUT after format testing

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <!710>
29 jobs for !710 with debug in 75 minutes and 25 seconds (queued for 75 minutes and 18 seconds)
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