uidnobody and gidnobody are nobody's business

Original issue 238 created by inferno-os on 2010-07-28T08:09:28.000Z:

on Unix systems, emu//os.c fetches the uid and gids of "nobody" to be used by emu//cmd.c in an obscure way (eg, when up->env->uid is -1). this should stop. it will only work anyway if running as nobody or as root(!), and even then it's only invoked in peculiar cases, when it would be better to stop.