duplicate_key_in_meta_yaml doesn't respect selectors

[dpryan79]

This is understandable given how it's done, but when yaml.load hits a duplicate key it throws an error that's passed on as a linter error that can't be skipped. That's often going to be correct, but it doesn't then respect selectors, such as in https://github.com/bioconda/bioconda-recipes/pull/16968. We should really come up with a way around this, as a number of recipes can not longer be "built" because of it. The normal cause of this is that binaries are being redistributed, which while not ideal is sometimes the only option.