COMP: Upgraded ITKv5_VERSION, to fix elastix compile errors with ITK5
COMP: Upgraded ITKv5_VERSION, to fix elastix compile errors with ITK5

Upgraded ITKv5_VERSION to today's revision of ITK's git master branch, which includes:

  COMP: Fix support itk::VectorContainer<TElementIdentifier, bool>
  https://github.com/InsightSoftwareConsortium/ITK/commit/8bd9a0d58c19adc38c0e58ea65be2fedaa2962e6

  COMP: Fix SymmetricEigenAnalysis support TMatrix = itk::Array2D<T>
  https://github.com/InsightSoftwareConsortium/ITK/commit/d7e352985f6c8e44cec02d9ad7e6eecebe32595f

These fixes appear necessary to compile elastix with ITKv5

SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix