CI: temporarily disable clang install (#12486)

This will likely yield builds that have problems with unicode characters
but at least we can start testing the release while we try to find an
alternate clang compiler for windows, or mingw ships a fixed version.

.github/workflows/release.yaml

@@ -186,7 +186,8 @@ jobs:
         if: matrix.arch == 'amd64'
         run: |
           $ErrorActionPreference = "Stop"
-          Start-Process "C:\msys64\usr\bin\pacman.exe" -ArgumentList @("-S", "--noconfirm", "mingw-w64-clang-x86_64-gcc-compat", "mingw-w64-clang-x86_64-clang") -NoNewWindow -Wait
+          # TODO mingw-w64-clang-x86_64-clang v21 is currently broken for cgo build, but v20 + gcc-compat isn't available
+          # Start-Process "C:\msys64\usr\bin\pacman.exe" -ArgumentList @("-S", "--noconfirm", "mingw-w64-clang-x86_64-gcc-compat", "mingw-w64-clang-x86_64-clang") -NoNewWindow -Wait
           echo "C:\msys64\usr\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
           echo "C:\msys64\clang64\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
       - name: Install ARM64 system dependencies