mpm_winnt: make AP_MPMQ_GENERATION available in the child process as soon

as possible, so that hooks/modules can query it at config stage.
This is (e.g.) needed by r1702501 for PR 58024.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1703157 13f79535-47bb-0310-9956-ffa450edef68