r_bsp.c: fixed an unused variable warning
commented out some dead code (software poly renderer, R_Gen*Tile, R_EntityParticles)
early return for SCR_DrawFPS
d_sky68k.s: replaced fsqrt with the fast inverse square root
added fast approximate vector and square root functions
amiga: hwcl Makefile fix
amiga: fixed the SV_SpawnServer race condition on meso2 and romeric5
fix the light value for SURF_DRAWSOLID surfaces, cleanup