COMP: Update examples to the new build system to avoid warnings

[dzenanz]

Warning that was triggered:

CMake Warning (dev) at CMake/UseITK.cmake:28 (message):
  CMake/UseITK.cmake is deprecated.

  Please update CMakeLists.txt to use `find_package(ITK)` and link to
  "${ITK_INTERFACE_LIBRARIES}".

Call Stack (most recent call first):
  Modules/Remote/MorphologicalContourInterpolation/examples/CMakeLists.txt:12 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

[blowekamp]

LGTM

[blowekamp]

Are you building this module as part of the ITK build or as an independent build against an already build ITK?

I am not seeing much usage of itk_module_examples. Are you aware of any other use cases of it in a remote module?

Using find_package under the Modular Macro infrastructure seems... unique or unusual. I am actually not sure how dependencies of this itk_module_example are expressed.

https://github.com/KitwareMedical/ITKContourInterpolation/blob/main/CMakeLists.txt#L40

[dzenanz]

Yes, I was trying to build it as part of ITK build. I will try to restore the old detection of that via ITK_SOURCE_DIR.

[dzenanz]

The force-push fixes it.