[CMake][compiler-rt] Use copying instead of symlinking for LSE builtins on non-Unix...

[CMake][compiler-rt] Use copying instead of symlinking for LSE builtins on non-Unix-likes

As reported in D93278 post-review symlinking requires privilege escalation on Windows.
Copying is functionally same, so fallback to it for systems that aren't Unix-like.
This is similar to the solution in AddLLVM.cmake.

Reviewed By: ikudrin

Differential Revision: https://reviews.llvm.org/D98111

(cherry picked from commit ba860963b156db3b653c67ef044df877f3cea9cc)