Merge topic 'fix_ensight_overflows'

2ac151e6 EnsightGoldBinaryReader: template ReadInt to support both int and vtkIdType
814eba3a vtkEnSightGoldBinaryReader: fix overflows

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Reviewed-by: Jean Fechter <jean.fechter@kitware.com>
Merge-request: !11805