Set up r->path_info so that the PATH_INFO environment variable gets

passed on to the back end FastCGI process.

* modules/proxy/mod_proxy_fcgi.c
  (proxy_fcgi_canon): Use the post-hostname portion of the URL as the
   path info for the request.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/fcgi-proxy-dev@367170 13f79535-47bb-0310-9956-ffa450edef68