Webassembly version doesn’t work online and screen flashes on GLES2 are
opaque.

See https://github.com/DarkPlacesEngine/DarkPlaces/pull/169



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Signed-off-by: bones_was_here <bones_was_here@xonotic.au>
Co-authored-by: James O'Neill <hemebond@gmail.com>
Co-authored-by: bones_was_here <bones_was_here@xonotic.au>