Support IPv6 link-local scope IDs in Listen and VirtualHost, if built

with APR 1.7 or later:

* server/listen.c (match_address): New function, factored out from
  find_listeners.
  (find_listeners): Use it; add scope and temp pool arguments.
  (alloc_listener): Take scope_id and pool arguments and pass through;
  set zone for addresses if present.
  (ap_set_listener): Pass through temp pool and scope id.
  
* server/vhost.c (get_addresses): Set zone for vhost address if
  present.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1816609 13f79535-47bb-0310-9956-ffa450edef68