ci: install setuptools in macos environment

The latest macOS runner updated the version of python to 3.12.0.

This removes the deprecated distutils core module, requiring the "setuptools" package to be installed to provide it.

distutils is a dependency of MoltenVK.

.github/workflows/build.yml

@@ -97,6 +97,7 @@ jobs:
       if: runner.os == 'macOS'
       run: |
         brew install make ninja sdl2
+        pip install --no-input setuptools
         echo "MAKE=gmake" >> $GITHUB_ENV
         pushd thirdparty/MoltenVK
         ./build-moltenvk.sh