Introduce max policy version for compatibility with newer CMake versions

[StephenCWills]

GitHub Actions is updating to CMake 4.0.0 on all their Ubuntu runner images. This version has removed support for versions before CMake 3.5. Any chance we could get the minimum required version raised to resolve the following error?

CMake Error at build/_deps/lua-src/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

[walterschell]

Thanks for the fix. In order to preserve backward compatibility would you mind changing the fix to use cmake_minimum_required(VERSION 3.1...3.12) That way it doesn’t needlessly break ancient versions of CMake.

[StephenCWills]

FYI, I was trying to test this, but I couldn't get a newer runner image to execute my CI job. I looked into it, and it appears that GitHub downgraded their CI runners to avoid the breakage they introduced. They're also working to pin the CMake version so they can upgrade without this error happening.

Regardless, I went ahead and made the change you asked for. Perhaps it will come in handy for users running CMake 4.0.

[walterschell]

Thanks for the help!