BUG: ITKModuleExternal CMAKE_LIBRARY_OUTPUT_DIRECTORY when wrapping

When building a module externally, deposit its wrapping artifacts with
the rest of the ITK wrapping artifacts and other external module
wrapping artifacts so they can be found during test runtime.

Author: thewtex

CMake/ITKModuleExternal.cmake

@@ -40,7 +40,11 @@ if(NOT CMAKE_RUNTIME_OUTPUT_DIRECTORY)
   set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${ITK_DIR}/bin)
 endif()
 if(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
-  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${ITK_DIR}/lib)
+  if(ITK_WRAP_PYTHON)
+    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${ITK_DIR}/Wrapping/Generators/Python/itk)
+  else()
+    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${ITK_DIR}/lib)
+  endif()
 endif()
 if(NOT CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
   set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${ITK_DIR}/lib)