Fix the Windows MPM. Windows doesn't always use the lingering close

function. If it can re-use the socket, we are better off not calling
the function.  To fix this, we re-expose the lingering_close function,
and we allow the MPM to remove the cleanup.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91839 13f79535-47bb-0310-9956-ffa450edef68