[NO UPSTREAM] readme: explain this fork · thoughtpolice/buck2@f1117b2

Treating cmake as a formula. For the cask, use homebrew/cask/cmake or specify the `--cask` flag. To silence this message, use the `--formula` flag.

cmake 3.31.3 is already installed and up-to-date. To reinstall 3.31.3, run: brew reinstall cmake

python@3.13 3.13.1 is already installed and up-to-date. To reinstall 3.13.1, run: brew reinstall python@3.13

zstd 1.5.6 is already installed and up-to-date. To reinstall 1.5.6, run: brew reinstall zstd

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