Modify mod_cgid to use bucket brigades. This means that mod_cgid behaves

like mod_cgi, creating a single element bucket brigade that is passed to
the next filter.  This is instead of making mod_cgid read from the socket,
and call ap_r* repeatedly.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86198 13f79535-47bb-0310-9956-ffa450edef68