Move to separate CIBW_BEFORE_BUILD

Author: ddelange

.github/workflows/wheels.yml

@@ -113,7 +113,9 @@ jobs:
       env:
         CIBW_BUILD_VERBOSITY: 1
         # add compiled libmagic to the build directory (to include in the wheel)
-        CIBW_BEFORE_BUILD: ${{ ( startsWith( matrix.os, 'macos' ) && 'sudo -E bash add_libmagic.sh' ) || 'bash add_libmagic.sh' }}
+        CIBW_BEFORE_BUILD_MACOS: sudo -E bash add_libmagic.sh
+        CIBW_BEFORE_BUILD_LINUX: bash add_libmagic.sh
+        CIBW_BEFORE_BUILD_WINDOWS: pip install setuptools
         # build macos wheels with maximum backwards compatibility (gcc -mmacosx-version-min flag)
         MACOSX_DEPLOYMENT_TARGET: ${{ ( endsWith( matrix.only, 'arm64' ) && '11.0' ) || '10.9' }}
         # simple smoke test run on each wheel: this is an HLS MP4 video, only recognised in recent versions of libmagic