gha: build - another try at fixing OpenMP includes

Author: codeling

.github/workflows/build.yml

@@ -136,7 +136,8 @@ jobs:
         #port contents qt6-qthttpserver
         #port contents qt6-qtwebsockets
         echo "OPENIA_CMAKE_OPTIONS=${{env.OPENIA_CMAKE_OPTIONS}} -DQt6Charts_DIR:PATH=/opt/local/libexec/qt6/lib/cmake/Qt6Charts -DQt6HttpServer_DIR:PATH=/opt/local/libexec/qt6/lib/cmake/Qt6HttpServer -DQt6WebSockets_DIR:PATH=/opt/local/libexec/qt6/lib/cmake/Qt6WebSockets -DOpenMP_CXX_FLAGS:STRING=\"-Xpreprocessor -fopenmp -lomp\" -DOpenMP_CXX_INCLUDE_DIR:PATH=\"/opt/homebrew/opt/libomp/include\" -DOpenMP_libomp_LIBRARY:FILEPATH=\"/opt/homebrew/opt/libomp/lib/libomp.dylib\"" >> "$GITHUB_ENV"
-        ln -s /opt/homebrew/opt/libomp/include/omp.h /usr/include/omp.h
+        sudo mkdir -p /usr/local/include
+        ln -s /opt/homebrew/opt/libomp/include/omp.h /usr/local/include/omp.h
 
     ##################################################################
     # VR: OpenXR, OpenVR, boost