CMP0122

UseSWIG use library name conventions for CSharp language.

Starting with CMake 3.21, UseSWIG generates now a library using default naming conventions. This policy provides compatibility with projects that expect the legacy behavior.

This policy was introduced in CMake version 3.21. CMake version 3.21.0-rc3 warns when the policy is not set and uses OLD behavior. Use the cmake_policy() command to set it to OLD or NEW explicitly.