[issue32711] Fix warnings for Python/ast_unparse.c

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

then I will use the approach of Victor with the Py_UNREACHABLE macro and will push asap.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32711>
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