Unbreak etcupdate(8) and mergemaster(8) after r352950

r352950 introduced improper case fall-through for shell scripts. Fix it with
a pipe.

Reported by:	lwhsu, David Wolfskill

usr.sbin/etcupdate/etcupdate.sh

@@ -595,8 +595,7 @@ post_install_file()
 				NEWALIAS_WARN=yes
 			fi
 			;;
-		/usr/share/certs/trusted/*)
-		/usr/share/certs/blacklisted/*)
+		/usr/share/certs/trusted/* | /usr/share/certs/blacklisted/*)
 			log "certctl rehash"
 			if [ -z "$dryrun" ]; then
 				env DESTDIR=${DESTDIR} certctl rehash >&3 2>&1

usr.sbin/mergemaster/mergemaster.sh

@@ -883,8 +883,7 @@ mm_install () {
     /etc/mail/aliases)
       NEED_NEWALIASES=yes
       ;;
-    /usr/share/certs/trusted/*)
-    /usr/share/certs/blacklisted/*)
+    /usr/share/certs/trusted/* | /usr/share/certs/blacklisted/*)
       NEED_CERTCTL=yes
       ;;
     /etc/login.conf)