[compiler-rt] [builtins][CMake] Replace custom target for lse_builtin symlinks (PR #66936)

[Owen Shepherd via llvm-commits]

414owen wrote:

👋 Hi,

The first hunk of this patch fixes build failures for me (building the 12.x branch, through nixpkgs), where cmake refuses to overwrite an existing symlink with a new one.

Would it be possible to backport this to other release branches?

https://github.com/llvm/llvm-project/pull/66936