update the IRIX readme with details on how to build with the better compiler now
update the IRIX readme with details on how to build with the better compiler now


kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1