Kerberos tries to install into /usr/include/ss, we better have it made

at installation time.

src/etc/mtree/4.4BSD.dist

@@ -1,5 +1,5 @@
 #	from: @(#)4.4BSD.dist	8.1 (Berkeley) 6/13/93
-#	$Id: 4.4BSD.dist,v 1.6 1995/12/19 10:28:15 deraadt Exp $
+#	$Id: 4.4BSD.dist,v 1.7 1995/12/25 23:28:24 niklas Exp $
 
 /set type=dir uname=root gname=wheel mode=0755
 # .
@@ -150,6 +150,11 @@ rpcsvc		gname=bin uname=bin mode=0555
 # ./usr/include/rpcsvc
 ..
 
+# ./usr/include/ss
+ss		gname=bin uname=bin mode=0555
+# ./usr/include/ss
+..
+
 # ./usr/include
 ..