Log Message:
mksandbox-1.3:

 - Add /usr/sfw to SunOS mount dirs, required for certain binaries on
   newer releases.
 - Mount proper instances of /dev and /dev/fd on SunOS rather than relying
   on devfsadm and ucblinks, the latter of which does not exist on newer
   releases.
 - Do not create /var/games if the games user does not exist.