Mark everything under /opt/ros a system header (#191)

* Mark everything under /opt/ros a system header

* Try with extra quotation marks

.github/workflows/reusable-industrial-ci-with-cache.yml

@@ -118,6 +118,7 @@ jobs:
           ADDITIONAL_DEBS: ${{ inputs.additional_debs }}
           CC: ${{ inputs.c_compiler }}
           CXX: ${{ inputs.cxx_compiler }}
+          CMAKE_ARGS: -DCMAKE_CXX_FLAGS="-isystem /opt/ros/${{ inputs.ros_distro }}/include"
         id: ici
       - name: Download issue template for target failure  # Has to be a local file
         if: ${{ always() && steps.ici.outcome == 'failure' && github.event_name == 'schedule' }}