linelog: suppress annoying pytype warning about an ignored metaclass
This isn't actively hurting us right now, and it's not trivial to set
up this metaclass correctly on both Python 2 and Python 3 without
dragging in all of `six`, but we still get lots of typechecking
goodness with this error suppressed.
Differential Revision: https://phab.mercurial-scm.org/D7270
Mercurial
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