[patch] Use dlsym instead of glXGetProcAddress in xdriinfo

[Ian Romanick]

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Eric Anholt wrote:

> @@ -57,8 +58,8 @@
>      char *funcArg = NULL;
>      char *dpyName = NULL;
>  
> -    GetScreenDriver = (glXGetScreenDriver_t *)glXGetProcAddress ("glXGetScreenDriver");
> -    GetDriverConfig = (glXGetDriverConfig_t *)glXGetProcAddress ("glXGetDriverConfig");
> +    GetScreenDriver = (glXGetScreenDriver_t *)glXGetProcAddressARB ("glXGetScreenDriver");
> +    GetDriverConfig = (glXGetDriverConfig_t *)glXGetProcAddressARB ("glXGetDriverConfig");
>      if (!GetScreenDriver || !GetDriverConfig) {
>  	fprintf (stderr, "libGL is too old.\n");
>  	return 1;

Actually, this code is totally bogus.  In X.org's default libGL,
glXGetProcAddress *NEVER* returns NULL.  Ever.  Replace
"glXGetScreenDriver" above with "glXLikesToSegfault" and you'll see what
I mean. :)
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