[issue35883] Change invalid unicode characters to replacement characters in argv

[Eryk Sun]

Change by Eryk Sun <eryksun at gmail.com>:


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components: +Unicode
nosy: +ezio.melotti, vstinner
versions:  -Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35883>
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