COMP: fix linkage for MINCTransformIO

Address issue with MSVC when shared libraries enable. The following
warning is emitted:

itkMINCTransformIO.h(137,88): warning C4910: 'itk::MINCTransformIOTemplate<float>': '__declspec(dllexport)' and 'extern' are incompatible on an explicit instantiation

Modules/IO/TransformMINC/include/itkMINCTransformIO.h

@@ -40,7 +40,7 @@ namespace itk
  * \ingroup ITKIOTransformMINC
  */
 template <typename TParametersValueType>
-class ITKIOTransformMINC_EXPORT MINCTransformIOTemplate : public TransformIOBaseTemplate<TParametersValueType>
+class ITK_TEMPLATE_EXPORT MINCTransformIOTemplate : public TransformIOBaseTemplate<TParametersValueType>
 {
 public:
   using Self = MINCTransformIOTemplate;