Cut free mpm_common.c from ap_max_daemons_limit as a variable. Now we

get the value from the MPM and thus free the MPM to use any variable
name they like.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85655 13f79535-47bb-0310-9956-ffa450edef68