[PATCH] Implement software DXT1 compression

[alberto at mattea.info]

> An idea that was proposed before was to delegate the conversion (and the
> patents burden) to the OpenGL drivers, something like using
> glCompressedTexImage2D() / glGetCompressedTexImage(). Not sure
> whether there are hidden issues with that approach (except, well, requiring
> an OpenGL driver with compressed textures support), but at a first glance
> it doesn't look as something particularly hard to do.

Good idea. This new patch implements this approach. It seems to be working
perfectly at least with the nvidia blob. It is also much smaller than the
previous one, and doesn't require hacks like inverting colors and so on.
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