Subject: dired-font-lock-keywords should warn about SUID files too!

From: [email-masked]
Date: Sun, 06 Mar 2011 13:12:34 +0800

dired-font-lock-keywords is nice, but it totally forgot about the more
dangerous SUID and SGID 4xxx and 2xxx mode files! E.g.,
  -rwsr-xr-x  1 root root     33 Mar  6 12:59 somefile