[issue24009] Get rid of rare format units in PyArg_Parse*

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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dependencies: +Convert os._getfullpathname() and os._isdir() to Argument Clinic

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24009>
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