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run-tests: explicitly track that `pythondir` was inferred

Authored by marmoute.

Description

run-tests: explicitly track that pythondir was inferred

If we want to know that something happened, we should simply track that this
things happened.

This will be useful to start using tmpbindir more in a different form.

Differential Revision: https://phab.mercurial-scm.org/D11043