Make use of Travis's conditional jobs. #44631
Merged
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Conditional jobs: https://docs.travis-ci.com/user/conditional-builds-stages-jobs/#Conditional-Jobs.
Jobs not matching the condition will not be scheduled at all. This allows us to get rid of
$ALLOW_PR
/$ALLOW_TRY
/$SKIP_BUILD
in.travis.yml
, and perfectly prevent spurious PR failures due to flaky macOS machines.