Change ap_construct_url() so that the r->hostname is used in

the URL instead of the value of the ServerName directive. This
stops Apache redirecting to a different website name to the
one the user typed in, which can break cookies and javascript
handling on the client.
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@94084 13f79535-47bb-0310-9956-ffa450edef68