[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> This bypasses the CRT's copy of the environment. If any C code calls [_w]getenv, it will still see the variable defined. The only way it won't is if setting the value also bypassed the CRT environment by directly calling SetEnvironmentVariableW.

Oh. That's a valid concern. I reopen the issue.

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resolution: fixed -> 
status: closed -> open

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39413>
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