[Mesa-stable] [PATCH v2] st: require compatible driver in autotools

[Alyssa Ross]

> Off the top of my head - none of the VL code should be build when we
> have only a swrast driver.
> Can you try and kill that bug, or shall I?

Isn't that what this patch does?

If there's only swrast, this patch prevents enabling any of the state
trackers, so need_gallium_vl won't be set, and VL won't be built.
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