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Update macOS build-installer script comments for 3.10 and remove unused pre-10.5 vestiges. (GH-27253)

(cherry picked from commit 42205ee512159de62c01e202ff799d78fac9ac26)

Co-authored-by: Ned Deily <nad@python.org>
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Miss Islington (bot) committed
416f418a11655e97d2cf3a8bd29e0968954caee3
Parent: 9ae5ba7
Committed by GitHub <noreply@github.com> on 7/20/2021, 5:30:29 PM