[quake3] ioq3 framebuffer support

[Robert Isaac]

> Robert, could you please check to see if the problem you were having
> with single player team arena persists? try as i might i can't recreate
> what you are having (if all fails, try resetting your config file


The problem is still there after nuking the config, so it is something else.

This is on an x86_64 system with the missionpack vm directory (and its
qvms) compressed as pak4.pk3
Start a single player missionpack game of any gametype
play through it
hit "next" on the endofgame menu

Sys_Error: VM_Call with NULL vm

I've also noticed it with x86, in wine, and of course with the other
implementation of bloom. This seems to have happened after r1202 (as
that worked fine).