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hg-core: add a compilation error if trying to compile outside of Linux

Authored by Alphare.

Description

hg-core: add a compilation error if trying to compile outside of Linux

For now, we can only provide support for Linux in hg-core, so we have to be
explicit about it in case anyone wonders why their Dirstate is suddenly broken,
or why the crate does not compile (on Windows for example).

Differential Revision: https://phab.mercurial-scm.org/D8246