[issue43680] Remove undocumented io.OpenWrapper and _pyio.OpenWrapper

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

OpenWrapper was added in ce3a72aec6eaa0293c397c8d0407f7afe0072b2f (issue1267) and was only used to set __builtin__.open (I suppose that at thet moment dumbdbm.py still set open as a class attribute).

It is still can be set as a class attribute in user code, so I think that removing OpenWrapper needs a deprecated period.

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nosy: +christian.heimes, gvanrossum

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