Mac work...

[Ryan C. Gordon]

I spent some time moving the Mac version to the Makefiles and SDL, in 
hopes that we can eventually have one codepath for all platforms, more 
or less.

This still needs some work, and there's some other things addressed in 
this patch that aren't necessarily Mac-specific (dlopen is replaced with 
SDL_LoadObject and SDL_GL_LoadLibrary, etc)...if anyone wants to take a 
look at the current state, here's the patch.

There are still broken things...debug builds are hosed if you use 
Altivec (presumably for alignment reasons, etc), plus some other 
glitches that need to be weeded out, etc. This is not ready for 
primetime, especially if we're talking about making a release soon.

--ryan.

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