ITS#9817 Fix test087 set up

tests/scripts/test087-librewrite

@@ -21,6 +21,8 @@ if test $RWM = rwmno ; then
 	exit 0
 fi
 
+mkdir -p $TESTDIR
+
 echo "" >>$TESTOUT
 echo "# making a filter from a DN" > $TESTOUT
 echo "Testing DN unescaping then escaping for use in a filter..."