[PATCH] dri3: Don't enable the DRI3 extension unless some screen supports it

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> There's no reason to advertise this extension unless one of the
> hardware drivers actually supports it. Not listing it means it's
> slightly easier for users to tell what's going on.
>
> On the other hand, not listing it means we may have applications that
> only check for the extension and not for appropriate per-screen
> support. I don't think that's a real risk as DRI3 is only useful for
> systems with deep knowledge of the hardware.

Reviewed-by: Eric Anholt <eric at anholt.net>
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