C++17 compiler warning regarding type

[hjmjohnson]

In file included from /Users/johnsonhj/src/BT-14/ANTs/Examples/antsApplyTransforms.cxx:29:
/Users/johnsonhj/src/BT-14/ITKv5/Modules/Remote/GenericLabelInterpolator/include/itkLabelImageGenericInterpolateImageFunction.h:40:61: warning:
template template parameter using 'typename' is a C++17 extension [-Wc++17-extensions]
template <typename TInputImage,template<typename, typename> typename TInterpolator, typename TCoordRep=double >
^~~~~~~~
class
In file included from /Users/johnsonhj/src/BT-14/ANTs/Examples/antsApplyTransforms.cxx:29:
In file included from /Users/johnsonhj/src/BT-14/ITKv5/Modules/Remote/GenericLabelInterpolator/include/itkLabelImageGenericInterpolateImageFunction.h:127:
/Users/johnsonhj/src/BT-14/ITKv5/Modules/Remote/GenericLabelInterpolator/include/itkLabelImageGenericInterpolateImageFunction.hxx:27:61: warning:
template template parameter using 'typename' is a C++17 extension [-Wc++17-extensions]
template<typename TInputImage, template<typename, typename> typename TInterpolator , typename TCoordRep>
^~~~~~~~
class
/Users/johnsonhj/src/BT-14/ITKv5/Modules/Remote/GenericLabelInterpolator/include/itkLabelImageGenericInterpolateImageFunction.hxx:58:61: warning:
template template parameter using 'typename' is a C++17 extension [-Wc++17-extensions]
template<typename TInputImage, template<typename, typename> typename TInterpolator , typename TCoordRep>
^~~~~~~~
class