This broke texture-from-pixmap in OBS Studio so I must have done
something wrong and also we need better tfp testing.

This reverts commit b02b26b8.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4718


Acked-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10593>