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hghave: add a `rust` keyword to detect the use of compiled rust code

Authored by marmoute.

Description

hghave: add a rust keyword to detect the use of compiled rust code

The content of some on disk cache can varies when using rust (because it is
faster to do so in the rust variant). So we need to be able to detect this case
for some test.

Differential Revision: https://phab.mercurial-scm.org/D8162

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