GLQuake IRIX MesaFX port

GLQuake port with MesaFX backend, with dual TMU support. -driver sources (SST1 and CVG support on IP32) https://github.com/sdz-mods/tdfx_irix-glide2x IRIX port (SST1 on IP32) https://github.com/sdz-mods/glide_irix-MesaFX IRIX…