Add support for sending the FASTCGI_STDIN stream of data to the fastcgi

Add support for sending the FASTCGI_STDIN stream of data to the fastcgi
process.

* modules/proxy/mod_proxy_fcgi.c
  (fill_in_header): New helper function.
  (send_begin_request, send_environment): Fix formatting, use fill_in_header.
  (MAX_INPUT_BYTES): New constant.
  (send_stdin): New function.
  (fcgi_do_request): Send the body of the request via send_stdin.

Submitted By: Garrett Rooney <rooneg apache.org>

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/fcgi-proxy-dev@359183 13f79535-47bb-0310-9956-ffa450edef68