[issue39406] Implement os.putenv() with setenv() if available

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

This indeed a good argument to continue to use _wputenv. Thank you Eryk, you have saved us from making a mistake.

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<https://bugs.python.org/issue39406>
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