/etc/security does not exist any longer,

so stop it from trying to check itself for changes;
noticed by Mattieu Baptiste <mattieu dot b at gmail dot com>.

src/etc/changelist

@@ -1,4 +1,4 @@
-#	$OpenBSD: changelist,v 1.72 2011/04/05 18:51:25 thib Exp $
+#	$OpenBSD: changelist,v 1.73 2011/04/19 21:59:49 schwarze Exp $
 #
 # List of files which the security script backs up and checks
 # for modifications.
@@ -122,7 +122,6 @@
 /etc/rpc
 /etc/rtadvd.conf
 /etc/sasyncd.conf
-/etc/security
 /etc/sensorsd.conf
 /etc/services
 /etc/shells