[issue14642] Fix importlib.h build rule to not depend on hg

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

When you do a fresh checkout, Python/importlib.h comes after Lib/importlib/_bootstrap.py and Python/freeze_importlib.py in a lexicographical sort which leads to it have a newer timestamp and thus not triggering a new build of the file.

This is why Martin suggested at some point using hg status or something from a script to properly detect if something has changed that would warrant rebuilding.

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<http://bugs.python.org/issue14642>
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