contrib/python-zstandard/LICENSE

check-code: add a rules to catch os.path.abspath

All previous usages have been migrated. So let us add a check-code rules to
catch future usages.

We restrict it to mercurial/ and hgext/ because multiple other script never
depends on Mercurial modules.

Differential Revision: https://phab.mercurial-scm.org/D11072

Copyright (c) 2016, Gregory Szorc
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