disable LK catalyst shared object copy for macos

setup.py

@@ -157,7 +157,7 @@ def build_extension(self, ext: CMakeExtension):
         )
 
         # Ensure that catalyst shared object is copied to the build directory for pip editable install
-        if backend in ("lightning_kokkos"):
+        if platform.system() != "Darwin" and backend in ("lightning_kokkos"):
             source = os.path.join(f"{extdir}", f"lib{backend}_catalyst.so")
             destination = os.path.join(os.getcwd(), "build")
             shutil.copy(source, destination)