Externally built remote modules require duplication of Python3_ROOT_DIR

[dzenanz]

Description

If non-default Python version is chosen for ITK by creating cache entry Python3_ROOT_DIR (e.g. setting it to C:/Program Files/Python37), it needs to be also created and set to the same path for all the externally built remote modules too. Otherwise a run-time issue is created when trying to import itk:

  Message=Module use of python38.dll conflicts with this version of Python.
  Source=M:\Dev\ITK-vs19\Wrapping\Generators\Python\itk\StrainPython.py
  StackTrace:
  File "M:\Dev\ITK-vs19\Wrapping\Generators\Python\itk\StrainPython.py", line 13, in <module>
    from . import _StrainPython
  File "M:\Dev\ITK-vs19\Wrapping\Generators\Python\itk\support\itkBase.py", line 262, in load
    l_spec.loader.exec_module(l_module)  # pytype: disable=attribute-error
  File "M:\Dev\ITK-vs19\Wrapping\Generators\Python\itk\support\itkBase.py", line 110, in itk_load_swig_module
    l_module = loader.load(swig_module_name)
  File "M:\Dev\ITK-vs19\Wrapping\Generators\Python\itk\__init__.py", line 111, in _initialize_module
    _itkBase.itk_load_swig_module(module, sys.modules[__name__].__dict__)
  File "M:\Dev\ITK-vs19\Wrapping\Generators\Python\itk\__init__.py", line 123, in <module>
    _initialize_module()
  File "M:\Dev\ITK-git\Modules\Filtering\ImageIntensity\wrapping\test\itkImageFilterNumPyInputsTest.py", line 21, in <module>
    import itk

Expected behavior

Externally built remote modules pick up Python version from ITK, so duplicating manual specification of Python version is not necessary.

Versions

Affects current master.

[stale]

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