* Escape pathes of filenames in 406 responses to avoid HTML injections and

  HTTP response splitting.

PR: 46837
Submitted by: Geoff Keating <geoffk apple.com>
Reviewed by: rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@752812 13f79535-47bb-0310-9956-ffa450edef68