Update build_wheels_windows.yml

Author: avdivan

.github/workflows/build_wheels_windows.yml

@@ -190,18 +190,25 @@ jobs:
         cd ${{ github.workspace }}/tests
         &python -m pip install --user --no-warn-script-location (ls "../wheelhouse/opencv*.whl")
         if ($LastExitCode -ne 0) {throw $LastExitCode}
+        # Copy DLL next to cv2.pyd (Python 3.8+ needs this)
+        $cv2_path = python -c "import cv2; import os; print(os.path.dirname(cv2.__file__))"
+        Copy-Item "${{ github.workspace }}\wheelhouse\libopenblas.dll" "$cv2_path\libopenblas.dll"
         python get_build_info.py
       shell: powershell
       env:
         PATH: ${{ github.workspace }}\wheelhouse;${{ env.PATH }}
-        PYTHONPATH: ${{ github.workspace }}\wheelhouse;${{ env.PYTHONPATH }}
     - name: Run tests
       run: |
+        # Find cv2 install path
+        $cv2_path = python -c "import cv2; import os; print(os.path.dirname(cv2.__file__))"
+
+        # Copy DLL next to cv2.pyd
+        Copy-Item "${{ github.workspace }}\wheelhouse\libopenblas.dll" "$cv2_path\libopenblas.dll"
+
         cd ${{ github.workspace }}/opencv
         python modules\python\test\test.py -v --repo .
       env:
         PATH: ${{ github.workspace }}\wheelhouse;${{ env.PATH }}
-        PYTHONPATH: ${{ github.workspace }}\wheelhouse;${{ env.PYTHONPATH }}
 
     - name: Pylint test
       run: |