[issue21076] Turn signal.SIG* constants into enums

[Roundup Robot]

Roundup Robot added the comment:

New changeset b1f5b5d7997f by Victor Stinner in branch 'default':
Issue #21076: sigpending() is not available on Windows
http://hg.python.org/cpython/rev/b1f5b5d7997f

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21076>
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