Fix bug where non-200 CGI responses will not send anything down filter chain.

This is most notable when mod_cache is used.  This has been used in production
on wiki.apache.org for a while now.

* modules/generators/mod_cgi.c
  (cgi_handler): When a non-zero value is returned by scan_script, set the
  status field and ensure that we have an EOS to send down the filer stack.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@231167 13f79535-47bb-0310-9956-ffa450edef68