As cache_control_t is public, make ap_cache_control() public with it. Bump

the MMN for addition of ap_cache_control(), and the addition of cache_control_t
to the disk format.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1023397 13f79535-47bb-0310-9956-ffa450edef68