After removing National Language Support (NLS) from base, stop

creating the directory /usr/share/nls.  Having a non-existing default
path in catopen(3) does not make sense, so remove it.  If the user
does not specify a NLS path, better fail early than fail because
of an empty directory.  Remove path form hier(7).
OK stsp@ schwarze@ jmc@

src/etc/mtree/4.4BSD.dist

@@ -1,4 +1,4 @@
-#	$OpenBSD: 4.4BSD.dist,v 1.274 2015/10/10 09:45:15 ajacoutot Exp $
+#	$OpenBSD: 4.4BSD.dist,v 1.275 2015/11/05 23:38:07 bluhm Exp $
 
 /set type=dir uname=root gname=wheel mode=0755
 
@@ -613,8 +613,6 @@ usr
         ..
         mk
         ..
-        nls
-        ..
 
         # ./usr/share/snmp
         snmp