For reasons that are not clear to me yet, the translated versions of the

handbook fail to build on the cluster with no CVSup mirrors listed.  I
can't recreate this locally, but for now, add back a single mirror
(cvsup.freebsd.org, which is under clusteradm control).  Hopefully
that should be sufficient to allow the build to complete.

Noticed by:	wblock
Pointy hat to:	gavin

share/xml/mirrors.xml

@@ -21,6 +21,10 @@
       <url proto="httpv6">http://ftp.FreeBSD.org/pub/FreeBSD/</url>
     </host>
 
+    <host type="cvsup">
+      <name>cvsup.FreeBSD.org</name>
+    </host>
+
   </entry>
 
   <entry id="mirrors-primary">