When looking for new lines in diff output, grep for '^[>+]' instead of

'^>', in order to catch both normal and unified diffs.

Problem reported by:	volker at vwsoft dot com via -stable
MFC after:	3 days

etc/periodic/security/security.functions

@@ -43,7 +43,7 @@ check_diff() {
   rc=0
   if [ "$1" = "new_only" ]; then
     shift
-    filter="grep '^>'"
+    filter="grep '^[>+]'"
   else
     filter="cat"
   fi