[PATCH xdriinfo] Fix xdriinfo not working with glvnd

[Eric Anholt]

Hans de Goede <hdegoede at redhat.com> writes:

> For glx calls to work on libglvnd as glx provider we must first call
> glXGetClientString. This also means that we can no longer take the
> shortcut to not open the Display when a driver name is past to options.

This seems sensible.  Hopefully nothing is relying on this working
without an X connection being possible.

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