Made AB's use of the Host: header rfc2616 compliant as

reported by Taisuke Yamada <tai@iij.ad.jp>

PR:
Obtained from: Mailing list
Submitted by: Taisuke Yamada <tai@iij.ad.jp>
Reviewed by: Dirk-Willem van Gulik


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94355 13f79535-47bb-0310-9956-ffa450edef68