[8.20] Update compat infrastructure prior to branching #19026
Merged
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In a PR on master, call dev/tools/update-compat.py with the --release flag; this sets up Coq to support three -compat flag arguments including the upcoming one (instead of four). To ensure that CI passes, you will have to decide what to do about all test-suite files that mention -compat U.U or Coq.Compat.CoqUU (which is no longer valid, since we only keep compatibility against the two previous versions), and you may have to ping maintainers of projects that are still relying on the old compatibility flag so that they fix this.
(c.f. #18882 )