[issue19713] Deprecate various things in importlib thanks to PEP 451

[Nick Coghlan]

Nick Coghlan added the comment:

Arfrever: not at this point. We really should have an importlib.util.load_from_spec() that hides those internal details.

Larry - can we get away with adding that? It didn't become obvious it was a missing API until Eric started doing these conversions.

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nosy: +larry

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