Use build rather than pep517 for building #2784
Merged
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pep517 has been renamed to pyproject-hooks, and as a consequence all of the deprecated functionality has been removed. build now provides the functionality required, and since we are only interested in the metadata, we can leverage a helper function for that. I've also removed all of the subprocess machinery for calling the wrapping function, since it appears to not be as noisy as pep517.