diy: correct mangling of vtkm_diy target
Use internal vtkm_ notation of diy target whether VTKm was the bottom most nested or the root project in a cmake invocation. This is needed for VTK.
backport: release
Edited by Vicente Bolea
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Use internal vtkm_ notation of diy target whether VTKm was the bottom most nested or the root project in a cmake invocation. This is needed for VTK.
backport: release