Always emit Vary header if mod_deflate is involved in the request.

Submitted by:	Andr��Malo <nd@perlig.de>
Reviewed by:	Justin Erenkrantz


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97473 13f79535-47bb-0310-9956-ffa450edef68