Disable the dbm_ usage in mod_rewrite so that it links.

Still to do: decide at config time whether any modules need dbm, whether
             to use the native one or sdbm, etc.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85982 13f79535-47bb-0310-9956-ffa450edef68