[ut2004] Help with AS-Mothership

[Ryan C. Gordon]

> WOW! That made a _huge_ difference. That map is actually playable now. 
> Thanks! What does "VARSize" actually control?

Amount of memory, in megabytes, that we allocate for the
GL_vertex_array_range extension. Basically, this is the amount of static
geometry we can cache in AGP memory.

Mothership is a monster, so upping the allocation helps. Putting this
too high is bad, though. Putting it too low, as you saw, forces us off
the VAR path, which is very very slow.

--ryan.