add MTREE entries to change the permissions of executable programs such as usr/mdec/installboot and usr/mdec/binstall
at mrynet.com), NDWO-ified by me (so all bugs are probably my fault).
directory; the ramdisk build also relies on the termcap entry here, so this isn't totally useless. All based on work by Scott Taylor (sgimips at mrynet.com), with bugs most likely added by me.