Tweak the check of whether use_pep517 is false #6135
Merged
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This PR addresses the issue I pointed out in this comment: #6134 (comment)
I'm keeping this separate from PR #6134 since it's a different issue, it's a much smaller change, and it can be reviewed independently of that issue.
I'm also marking this as a release blocker because it's related to the initial PEP 517 release.