[llvm] [CMake] enable CMP0144 policy if available (PR #96589)

[Jerry Zhang Jian via llvm-commits]

jerryzj wrote:

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

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

https://github.com/llvm/llvm-project/pull/96589