Add a patch from Vincent Deffontaines to make the adding of X-forwarded-*

headers configurable: ProxyAddHeaders, defaulting to 'On'.
http://www.mail-archive.com/dev@httpd.apache.org/msg49971.html


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1060795 13f79535-47bb-0310-9956-ffa450edef68