[Mesa-dev] report ARB_cull_distance

[Dave Airlie]

Okay I've taken Tobias' last work in progress, cleaned it up a bit,
move the rename out into a separate patch, reordered things slightly.

I've dropped the separate passes, I think nearly all hw operates the
same, I do wonder why we even have this as an option, since at least
965/gallium always require the compiler to lower, we don't really
have other consumers that would care about this I don't think.

Dave.