At least one authorizer that doesn't use libfcgi directly

or indirectly does not like getting an empty FCGI_STDIN
block.  Don't send it.  (Other mods for httpd didn't send
it to authorizers either.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1541181 13f79535-47bb-0310-9956-ffa450edef68