Revert "bpo-17852: Maintain a list of BufferedWriter objects. Flush them on exit." #3337
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Reverts #1908
Reason: This change causes test_threading test_4_daemon_threads to seemingly fail at random times. I suspect either the test is buggy or this changed has exposed some other bug. The behaviour seems to be based on a race condition. I'm reverting it for now.
https://bugs.python.org/issue17852