[CMake] enable CMP0144 policy if available

[jerryzj]

• Enable CMP0144 policy if available, this will make the find_package() more robust.

[jerryzj]

I was having issue finding Zstd, and enabling this policy can make it works.

Reference: https://projects.blender.org/blender/blender/pulls/119120

[MaskRay]

I use CMake 2.28 and see CMP0144 warnings. This PR will fix that.

However, if I am reading https://cmake.org/cmake/help/latest/policy/CMP0144.html correctly, rg -g '*CMake*' '_ROOT\b', some mlir <PackageName>_ROOT variables need to be ported.

mlir/lib/Target/LLVM/CMakeLists.txt @fabianmcg @joker-eph

[fabianmcg]

@MaskRay are the warnings being caused by mlir/lib/Target/LLVM/CMakeLists.txt?
Because AFAICT mlir/lib/Target/LLVM/CMakeLists.txt is not really affected by the change of policy because the *_ROOT variable in question is: CUDAToolkit_LIBRARY_ROOT, which is defined by find_package(CUDAToolkit) (see CUDAToolkit_LIBRARY_ROOT) and not really a <PACKAGENAME>_ROOT variable.

[MaskRay]

@MaskRay are the warnings being caused by mlir/lib/Target/LLVM/CMakeLists.txt? Because AFAICT mlir/lib/Target/LLVM/CMakeLists.txt is not really affected by the change of policy because the *_ROOT variable in question is: CUDAToolkit_LIBRARY_ROOT, which is defined by find_package(CUDAToolkit) (see CUDAToolkit_LIBRARY_ROOT) and not really a <PACKAGENAME>_ROOT variable.

The warning is from top-level CMakeLists.txt. I think this PR is safe:)