Cmake minimum version?

[jkyang92]

build-libraries.cmake has cmake_policy(SET CMP0135 NEW), which only works for cmake >=3.24, on the other hand, cmake_minimum_version is set to 3.15. A minor annoyance with simply updating cmake_minimum_version is that Ubuntu's current LTS only has cmake 3.22

[mahrud]

It's silly that CMake can't just silently ignore non-existent policies ... I've just been commenting that line on older systems, but probably the simplest solution is to add a version check before the cmake_policy line and I'm fine if you want to do that.

[mahrud]

(Will be) fixed by #3373.