mpm_winnt: Eliminate wait_for_many_objects. Allows the clean

shutdown of the server when the MaxClients is higher then 257,
in a more responsive manner [Mladen Turk, William Rowe]

Per Mladen's +1, and that it's addressed all of Roy's concerns
with Mladen's original patch.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@584958 13f79535-47bb-0310-9956-ffa450edef68