Unified SDL branch

[Tim Angus]

On Mon, 3 Sep 2007 09:03:02 +0200 (CEST) vincent at cojot.name wrote:
> There is no GL/glext.h on Solaris/SPARC, under Solaris x86/x64 it is 
> provided by the NVidia drivers.
> 
> I have not checked the changed details but I wanted to report that...

I want to move towards requiring a set of up to date GL headers,
including glext.h (after all, Q3 uses a few GL extensions). Right now
qgl.h contains various kludges to work around poor/missing headers --
it's pretty nasty.

The alternative is to import the relevant headers into ioq3 itself, but
the former option is better I think.