backport simple list manipulation fix:

  *) Fix address-in-use startup failure caused by corruption of the list of
     listen sockets in some configurations with multiple generic Listen
     directives.  [Jeff Trawick]

Reviewed by: jim, wrowe  


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@483958 13f79535-47bb-0310-9956-ffa450edef68