Add support for starting multiple fastcgi processes listening on a

given socket.  This somewhat makes up for our lack of a good way to
manage connections to a given proxy backend.

* support/fcgistarter.c
  (main): Accept a new -N option that controls how many child procs
   we fork off.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/fcgi-proxy-dev@383774 13f79535-47bb-0310-9956-ffa450edef68