Infra: Remove GNU make-specific directive from Makefile #3891
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Like python/cpython#122662.
This is mostly to keep the
Makefile
s similar in each repo to ease maintenance.Also promote the
make check-links
deprecation warning (added in November 2023 in #3514) to an error, although we could probably remove it already?📚 Documentation preview 📚: https://pep-previews--3891.org.readthedocs.build/