Use err_headers_out for Vary and Alternates, since the new

send_http_header() now sends them for all responses.

Submitted by: Petr Lampa
Reviewed by: Roy Fielding, Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77806 13f79535-47bb-0310-9956-ffa450edef68