[quake3] Unified SDL branch

[Ryan C. Gordon]

>     svn co svn://svn.icculus.org/quake3/branches/unified-sdl/ ioq3-sdl/
> 
> This directory doesn't exist:  should be
> 
> svn://svn.icculus.org/quake3/branches/unified-sdl/

The "ioq3-sdl" thing at the end is where to do the checkout on your 
local system.

--ryan.