Get rid of some warnings which crept into the Unix MPMs a

few days ago.

mpm_common.h started referencing AP_MPM_NEEDS_RECLAIM_CHILD_PROCESSES
but did not include the header file where this might be defined.

The result was no prototype for ap_reclaim_child_processes() on
platforms which needed it.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88562 13f79535-47bb-0310-9956-ffa450edef68