Fix bug introduced in r1591508 which resulted in the final empty
FCGI_STDIN not being sent.  Interaction with latest uWSGI (and
probably other protocol implementations) breaks without this.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1603027 13f79535-47bb-0310-9956-ffa450edef68