Darwin CGL Patch

Attached is an archive with a completely new Darwin patch, along with
one extra file needed for the render spu.  The patch includes
everything needed to get chromium to work as intended under Darwin
(..so far).  This is a step beyond Jorge's patch in that it uses CGL in
the app_faker and AGL in the render SPU.

As of right now, this has only been 'fully' tested with the spheres
program, since it uses chromium directly.  It will still work for
non-chromium programs, but I cannot tell you how well it does right
now.  The only SPUs that I have been using are render and tilesort (and
error?), but the others should work as well.

to sum it up:  It all works well enough for me to at least run spheres
tiled across 3 G5s =)

The patch is a cvs diff of today's CVS head.

  -Chris