cmake DVISKORESDIY_HAS_MPI examples

Kitware/VTK ThirdParty/viskores/vtkviskores/viskores/viskores/thirdparty/diy/viskoresdiy/CMakeLists.txt :165 

target_compile_definitions(${lib_name}
        PRIVATE -DVISKORESDIY_HAS_MPI=${has_mpi_val}
        PRIVATE -Ddiy=${diy_prefix}         # mangle diy namespace
        PRIVATE ${diy_definitions})

Kitware/VTK ThirdParty/viskores/vtkviskores/viskores/viskores/thirdparty/diy/viskoresdiy/CMakeLists.txt :225 

target_compile_definitions(${diy_prefix} INTERFACE -DVISKORESDIY_HAS_MPI=1)

Kitware/VTK ThirdParty/viskores/vtkviskores/viskores/viskores/thirdparty/diy/viskoresdiy/CMakeLists.txt :230 

target_compile_definitions(${diy_prefix} INTERFACE -DVISKORESDIY_HAS_MPI=0)