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

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

> The status quo seems to work, but people like Georg think it's partially luck that
> it does and if hg changes its semantics that will cause us trouble.

Could you expand on that?

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nosy: +eric.araujo

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