[issue19255] Don't "wipe" builtins at shutdown

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I agree that it is risky and don't insist. We can return to this patch when encounter more serious bug.

Last commit breaks test_create_at_shutdown_without_encoding in test_io for Python implementation of io.

This happens because Python implementation of TextIOWrapper.__init__() imports the locale module if encoding is not specified. Then _find_spec() in Lib/importlib/_bootstrap.py iterates sys.meta_path, but "meta_path" is one of names cleared in sys in PyImport_Cleanup().

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nosy: +brett.cannon, eric.snow, ncoghlan

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<http://bugs.python.org/issue19255>
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