The recent fix to allow ProxyPass directories to be protected with user authentication

did not work when using mod_rewrite to do the mirror proxying.  This fixes it.
PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84472 13f79535-47bb-0310-9956-ffa450edef68