Since the new trust anchor format no longer contains constantly

changing timestamps we can track it in /etc/changelist.
OK sthen

src/etc/changelist

@@ -1,4 +1,4 @@
-#	$OpenBSD: changelist,v 1.123 2019/01/29 10:49:45 semarie Exp $
+#	$OpenBSD: changelist,v 1.124 2019/02/11 13:39:13 florian Exp $
 #
 # List of files which the security script backs up and checks
 # for modifications.
@@ -155,6 +155,7 @@
 /var/cron/cron.allow
 /var/cron/cron.deny
 /var/cron/tabs/root
+/var/db/unwind.key
 +/var/nsd/etc/nsd.conf
 /var/unbound/etc/unbound.conf
 /var/yp/Makefile.main