CI: Cross-build Windows Arm64, various cleanups · omf2097/openomf@911249f

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 3.31.1 is already installed and up-to-date. To reinstall 3.31.1, run: brew reinstall cmake

libpng 1.6.44 is already installed and up-to-date. To reinstall 1.6.44, run: brew reinstall libpng