Get the Unix MPMs restarting again. If we are going to register a cleanup

for ap_cleanup_scoreboard, then we have to kill that cleanup with the same
function.  This also makes ap_cleanup_scoreboard a non-static function, and
makes ap_cleanup_shared_mem a static function.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88012 13f79535-47bb-0310-9956-ffa450edef68