Backport PR #21307 on branch v3.5.x (Use in-tree builds for PyPy wheels)#21308

Merged

dstansby merged 1 commit intomatplotlib:v3.5.xfrom

meeseeksmachine:auto-backport-of-pr-21307-on-v3.5.x

Oct 7, 2021

Commits on Oct 7, 2021

Backport PR #21307: Use in-tree builds for PyPy wheels

dstansby
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meeseeksmachine
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