Add an option to disable using trove-classifiers package #221
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As requested in pypa/setuptools#4459, add a VALIDATE_PYPROJECT_NO_TROVE_CLASSIFIERS environment variable that can be used to disable using trove_classifiers package even if it is available. This can be used when the system features an outdated trove_classifiers, and therefore incorrectly triggers validation error. The change is designed to be absolutely minimal and non-intrusive.
I do realize you're probably going to reject this. Nevertheless, I believe it makes sense to send a pull request, so others who need a similar change can easily discover it.