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pytype: ignore abc.ABCMeta metaclasses that don't work on py3

See 70d42e2ad9b4 in hg:

    We can remove this when we're Python 3-only, but for now it's just too
    awkward to deal with and it's harmless.
5 jobs for topic/default/pytype-fixes in 4 minutes and 28 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed flake8 #48884

00:00:23

passed tests-py2-cext #48885

00:04:25

passed tests-py2-pure #48886

00:04:28

passed tests-py3-cext #48887

00:03:03

passed tests-py3-pure #48888

00:02:30