[issue25927] add dir_fd for mkstemp, and also maybe to all tempfile.*

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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dependencies: +Add support for dir_fd in shutil.rmtree()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25927>
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