Get smpt_os2 working again after recent reorganization.

- globalize & namespace protects server_conf as ap_server_conf
- puts setup_listeners back in under a more appropriate name
  (setup_listen_poll()) as it's quite different to ap_setup_listeners in
  mpm_common.c.
- fake a suitable parameter to ap_process_child_status() as it assumes a child
  refers to a process when, in the context of spmt_os2, it's a thread.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85841 13f79535-47bb-0310-9956-ffa450edef68