#20 fixing clean feature

Author: dimanikulin

.github/workflows/multi-platform-build.yml

@@ -52,9 +52,9 @@ jobs:
     - name: Clean up before build (Windows only)
       if: matrix.config.os == 'windows-latest'
       run: |
-        rmdir /s .ccache
+        cmd /c "rmdir /s /q .ccache"
         mkdir .ccache
-        rmdir /s build
+        cmd /c "rmdir /s /q build"
 
     - name: Checkout FVA repository
       uses: actions/checkout@v3