(Glide64) Remove unused util_init
(Glide64/libretro) Add 'veryhigh' accuracy mode - it's the previous settings with
Depthbuffer/Rasterize at the end. 'High' accuracy is now without
the final depthbuffer rasterization which works fine for the majority
of games without any perceivable accuracy loss - and it gets rid
of the overhead of one of the highest hitting functions - Rasterize.

Perfect Dark will still require accuracy to be set to 'very high' -
otherwise sun flares will go through walls and light coronas will not
be visible due to missing depth buffer rasterization stage