Add missing includes (backport #2401)

[mergify]

* ACE/examples/Reactor/WFMO_Reactor/Window_Messages.cpp:
* ACE/examples/Threads/task_four.cpp:
* ACE/examples/Threads/thread_pool.cpp:<hr>This is an automatic backport of pull request #2401 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 814302d has failed:

On branch mergify/bp/master/pr-2401
Your branch is up to date with 'origin/master'.

You are currently cherry-picking commit 814302d50b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   ACE/examples/Threads/task_four.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   ACE/examples/Reactor/WFMO_Reactor/Window_Messages.cpp
	both modified:   ACE/examples/Threads/thread_pool.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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