[issue30985] Set closing variable in asyncore at close

[Nir Soffer]

Nir Soffer added the comment:

Giampaolo, people using only 3.7 should probably use asyncio. Fixing
asyncore is more important to those that can use only 2.7 (e.g.Centos/RHEL)
or have to support both python 3 and 2.

Do you think using _closed is safer for backport? This can also clash with
existing code.

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