- build glsl as a host tool
- add the glsl objects to libmesa
- add/remove new/deleted sources for various components
- adjust the libmesa/libGL builds to pull in the new glsl objects
- re-apply the BUILDSYMLINK hack for eval.c/pixel.c/pixelstore.c
- use glsl to build the slang headers on the fly
- don't force linking dri_util.c into swrast_dri.so
- fix the source lists in libGL/OSmesa makefiles
- unobsolete the symbols/pc keymap and 7x14-KOI8-R.pcf.gz font
XXX the libGL/OSmesa makefiles could use some reorg. there
XXX are a bunch of duplicated items.