install infnan(3/VAX) into man3/vax/ on all archs;

clean make build tested on i386;
ok deraadt@, no objections from martynas@

src/etc/mtree/4.4BSD.dist

@@ -1,4 +1,4 @@
-#	$OpenBSD: 4.4BSD.dist,v 1.218 2011/09/19 08:06:23 okan Exp $
+#	$OpenBSD: 4.4BSD.dist,v 1.219 2011/09/22 04:56:09 schwarze Exp $
 
 /set type=dir uname=root gname=wheel mode=0755
 # .
@@ -1193,6 +1193,8 @@ loongson
 ..
 sgi
 ..
+vax
+..
 
 # ./usr/share/man/man3
 ..