There is no longer any need for different Listen directives to

use mapped/non-mapped addresses.  Also cleared up that not all
platforms support v6-only sockets.

Submitted by:  Colm MacCarthaigh <colm@stdlib.net>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@101336 13f79535-47bb-0310-9956-ffa450edef68