[issue20658] os.environ.clear() fails with empty keys (posix.unsetenv)

[STINNER Victor]

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

Attached set_unset_env.c program calls putenv("=hello world") and then unsetenv("").

On my Fedora 34 with glibc-2.33-20.fc34.x86_64, putenv() succeed, but unsetenv() fails.
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$ gcc set_unset_env.c -g -o set_unset_env && ./set_unset_env
putenv("=hello world") -> hello world
ERROR: unsetenv("") failed: [error 22] Invalid argument
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By the way, getenv() fails to find an environment variable if its name is empty: I reimplemented getenv() using the 'environ' variable for my test.

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Added file: https://bugs.python.org/file50245/set_unset_env.c

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<https://bugs.python.org/issue20658>
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