CMake 3.13 and SWIG Policy CMP0078 is not set

we now get a warning

Starting with CMake 3.13, ``UseSWIG`` generates now standard target
names. This policy provides compatibility with projects that expect the legacy
behavior.

The ``OLD`` behavior for this policy relies on
``UseSWIG_TARGET_NAME_PREFERENCE`` variable that can be used to specify an
explicit preference.  The value may be one of:

* ``LEGACY``: legacy strategy is applied. Variable
  ``SWIG_MODULE_<name>_REAL_NAME`` must be used to get real target name.
  This is the default if not specified.
* ``STANDARD``: target name matches specified name.

This policy was introduced in CMake version 3.13.  CMake version
3.13.0 warns when the policy is not set and uses ``OLD`` behavior.
Use the ``cmake_policy()`` command to set it to ``OLD`` or ``NEW``
explicitly.

we can set the policy to OLD, but need to investigate if the new mechanism will actually renaming the output.

Start by locating the project's CMake configuration that uses UseSWIG and inspect the generated target names under the current policy behavior. Compare the legacy and standard naming mechanisms, then determine whether setting CMP0078 to NEW preserves the expected output names; done means the CMake warning is resolved without breaking those names.