[issue14657] Avoid two importlib copies

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Otherwise some directory structure check could be done (e.g. find
> importlib/_bootstrap.py off of sys.path, and then see
> if ../Modules/Setup or something also exists that would never show up
> in an installed CPython).

Well, the directory structure check *is* pybuilddir.txt (under POSIX,
again; under Windows, you might want to check for Lib/importlib
directly).
But, agreed, this could be factored in a sys._private_something
attribute.

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<http://bugs.python.org/issue14657>
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