[issue14657] Avoid two importlib copies

[Antoine Pitrou]

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

> The question pybuildir.txt apparently tries to solve is whether Python
> is running from the build dir or not. It's not whether Python was
> installed or not.

That's the same, for all we're concerned.
But pybuilddir.txt does not only solve that problem. It also contains
the path to extension modules generated by setup.py, so that sys.path
can be setup appropriately at startup.

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