Fixes multilib (%LIB_DIR% should be replaced in ebuild)
--- a/torch/utils/cpp_extension.py
+++ b/torch/utils/cpp_extension.py
@@ -1478,10 +1477,10 @@ def library_paths(device_type: str = "cpu") -> list[str]:
     paths = [TORCH_LIB_PATH]
 
     if device_type == "cuda" and IS_HIP_EXTENSION:
-        lib_dir = 'lib'
+        lib_dir = '%LIB_DIR%'
         paths.append(_join_rocm_home(lib_dir))
         if HIP_HOME is not None:
-            paths.append(os.path.join(HIP_HOME, 'lib'))
+            paths.append(os.path.join(HIP_HOME, '%LIB_DIR%'))
     elif device_type == "cuda":
         if IS_WINDOWS:
             lib_dir = os.path.join('lib', 'x64')