permits on /dev/tty after install

[rudy at chukran.austin.ibm.com]

The reason for the change is simply "it's a bug".  
1. edit the file /usr/bin/dskt.proto and find where the /dev/tty device
is defined (search for tty) and you will see the offending 622 permissions.
Change this to 644.
 bosboot -c -d /dev/rfd0 -p /usr/bin/dkst.proto -f /usr/bin/dskt.fs -b
/tmp/dkst.image
  dd if=/tmp/dkst.image of=/dev/rfd0 ibs-1b obs=90b conv=sync

The permissions for the /dev files are taken from the filesystem on the
boot floppy, not
from the image on the tape.
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