COMP: Added missing #include <itkImageRegionConstIterator.h>
COMP: Added missing #include <itkImageRegionConstIterator.h>

Added missing #include directive to elastix itkComputeImageExtremaFilter.hxx

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