[PATCH] GLX: Avoid a crash if we ever end up trying to use glapi_noop_table

[Jon TURNEY]

I'm not sure if this is patch-worthy or not, but whilst getting GLX to work 
again on Cygwin/X I came across this...

If the GL dispatch table pointer points to glapi_noop_table, (due to some kind 
of terrible failure during GL initialization), running glxinfo for e.g. will 
crash the X server, as DoGetString(GL_VERSION) tries to do atof() on the null 
pointer returned by the noop dispatch function.

Given that all that noop dispatch table stuff is in there, I guess it's 
preferable that it doesn't crash in that case.

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