[quake2] misc patches

[Vincent Cojot]

On 27 Sep 2002, Michel [ISO-8859-1] Dänzer wrote:

> 3) The SDL GL renderer needs have_stencil, and while we're at it add
>    support for a stencil buffer :)
>

Your patch to rw_sdl.c is much better than mine (mine only fixes the
compile problem).. I'll merge with src/solaris/rw_sdl.c and re-send a
patch to brendan..

> Keep up the good work!

Thanks for your patches.. I'll leave it up to brendan to check the first
two..

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