patch 9.0.1448: diff test fails on MacOS 13 Commit: https://github.com/vim/vim/commit/d76670fc0d9bd9e09d8a3aa68ef58f796136d964 Author: ichizok <gclient.gaap@gmail.com> Date: Thu Apr 13 17:23:45 2023 +0100 patch 9.0.1448: diff test fails on MacOS 13 Problem: Diff test fails on MacOS 13. Solution: Install GNU diffutils. (Ozaki Kiichi, closes https://github.com/vim/vim/issues/12258)

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