[issue21076] Turn signal.SIG* constants into enums

[Roundup Robot]

Roundup Robot added the comment:

New changeset c9239171e429 by Giampaolo Rodola' in branch 'default':
fix #21076: turn signal module constants into enums
http://hg.python.org/cpython/rev/c9239171e429

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nosy: +python-dev

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