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Use OpenMP include path

Michael Kuronrequested to merge
mac-openmp into master

This is needed when the OpenMP header is not in the default search path. On macOS with libomp installed from MacPorts, the following now works:

cmake . \
  -DCMAKE_BUILD_TYPE=Release \
  -DWALBERLA_BUILD_WITH_MPI=OFF \
  -DWALBERLA_BUILD_WITH_OPENMP=ON \
  -DOpenMP_libomp_LIBRARY=/opt/local/lib/libomp/libomp.dylib \
  -DOpenMP_C_INCLUDE_DIR=/opt/local/include/libomp \
  -DOpenMP_CXX_INCLUDE_DIR=/opt/local/include/libomp

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