[issue21736] Add __file__ attribute to frozen modules

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

I've merged the change to add __file__ for frozen stdlib modules (when possible) and to set __path__ appropriately.  There are still a number of things to address though:

* set co_filename (for tracebacks)
* implement FrozenImporter.get_filename()
* implement FrozenImporter.get_source()

And then there's the question of supporting __file__, etc. for custom frozen modules.  Presumably all those things are still covered by this issue so I'm leaving it open.

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stage: patch review -> needs patch
versions: +Python 3.11 -Python 3.4, Python 3.5

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