7.0 configure of xdriinfo

[Matthias Hopf]

The configure script for xdriinfo checks for glXGetProcAddress. This is
only part of the not-yet released GLX 1.4 spec. Up to GLX 1.3 only
glXGetProcAddressARB is available.

This basically forbids building xdriinfo on systems with the proprietary
nvidia driver (+ libGL) installed. I changed this to
glXGetProcAddressARB, as it is supported in Mesa as well, and even Mesa
uses it internally more likely (e.g. in glut) than the GLX 1.4 function.

Any objections?

Matthias

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Matthias Hopf <mhopf at suse.de>       __        __   __
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