[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)