Fix confused map cache (with maps in different VHs using

the same name).

PR: 26462
Reviewed by: Jeff Trawick, Joe Orton


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@104759 13f79535-47bb-0310-9956-ffa450edef68