Clean up record header parsing a bit. This may fix the problems some

Clean up record header parsing a bit.  This may fix the problems some
people have seen where rid != request_id.

* modules/proxy/mod_proxy_fcgi.c
  (dispatch): Stop initializing things we're just going to assign over
   them later, initialize all of the rid and clen variables, and fix a
   warning from passing an unsigned char array into apr_socket_recv by
   adding a cast to char *.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/fcgi-proxy-dev@365813 13f79535-47bb-0310-9956-ffa450edef68