Fix seg fault in HTTP_IN when trying to handle the LimitRequestBody

directive when reading a proxy response. We should bypass LimitRequestBody
activities when handling a response from the proxied server.

I don't think this will circumvent requestbody checking on a large request
coming into the server that is destined to be proxied. (not tested though).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92722 13f79535-47bb-0310-9956-ffa450edef68