Actually bump MMN for:

 * 20101017.0 (2.3.9-dev)  Make ap_cache_control() public, add cache_control_t
 *                         to mod_disk_cache format.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1024357 13f79535-47bb-0310-9956-ffa450edef68