Merge of r1758083 from trunk:

mod_cgid: Resolve a case where a short CGI response causes a subsequent
     CGI to be killed prematurely, resulting in a truncated subsequent
     response. 


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758798 13f79535-47bb-0310-9956-ffa450edef68