[issue8393] subprocess: support undecodable current working directory on POSIX OS

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> PEP 277 explicitly states that unicode strings should be passed to
>  wide-character functions, whereas byte strings use "standard"
> functions. This is done in posixmodule.c, for example.

CreateProcessW takes a lot of arguments. Should we CreateProcessA or CreateProcessW if some arguments are byte string and other are unicode string?

> The "current locale" is a moving thing.

Don't CreateProcessA do the same thing? Convert byte string to unicode using the current locale. To use the right words, by "current locale" I mean the "mbcs" Windows codec.

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