Add another.

src/etc/shells

@@ -1,7 +1,9 @@
-#	$OpenBSD: shells,v 1.2 1996/05/26 10:25:31 deraadt Exp $
+#	$OpenBSD: shells,v 1.3 1996/08/14 06:36:59 downsj Exp $
 # List of acceptable shells for chpass(1).
 # Ftpd will not allow users to connect who are not using
 # one of these shells.
 
 /bin/sh
 /bin/csh
+/bin/ksh
+/bin/pdksh