Backport the fix to an edge case; it's now much more efficient to 
  entirely skip request body determinations for subrequests, stuff
  in an EOS and we are off to the races, ready to create a body-less
  proxied subrequest.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/proxy-reqbody-2.0.x@230725 13f79535-47bb-0310-9956-ffa450edef68