[issue31536] `make regen-all` triggers wholesale rebuild

[Antoine Pitrou]

Antoine Pitrou added the comment:

> If it works well, maybe it's worth it to backport the change to the 3.6 branch. We still backport a lot of changes to 3.6. But maybe wait until 3.6.3 final is released?

Fair enough. Does someone want to do the backport? :-)

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