[issue39413] Implement os.unsetenv() on Windows

[Eryk Sun]

Eryk Sun <eryksun at gmail.com> 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.

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nosy: +eryksun

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<https://bugs.python.org/issue39413>
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