try to fix this build action

.github/workflows/build.yml

@@ -68,6 +68,8 @@ jobs:
         if [ "${{ matrix.host }}" = "ubuntu-latest" ]; then
           sudo apt-get update
           sudo apt-get install -y mingw-w64
+        elif [ "${{ matrix.host }}" = "macOS-latest" ]; then
+          brew install mingw-w64
         fi
     - name: Cross-compile
       run: cargo build --verbose --target ${{ matrix.target }}