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Fix vtkSMPThreadLocal<LocalDataType> pointer init (vtkGeometryFilter)

Timothée Couble requested to merge timothee.couble/vtk:fix-vtkGeometryFilter-threadLocal into master

The vtkSMPThreadLocal<LocalDataType> struct in vtkGeometryFilter was missing a copy constructor for OpenMP and STDThread SMPTools backend as they use a copy, which led that all threads shared the same pointer (segfault).

Bug detected with !7850 (merged)

Edited by Timothée Couble

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