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

[Brett Cannon]

New submission from Brett Cannon <brett at python.org>:

A shell or Python script should be used to verify that importlib.h actually needs to be rebuilt, and if so make sure that it's even possible (since it depends on a locally built ./python).

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components: Build
messages: 158944
nosy: brett.cannon, georg.brandl, loewis
priority: release blocker
severity: normal
stage: needs patch
status: open
title: Fix imoprtlib.h build rule to not depend on hg
type: compile error
versions: Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14642>
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