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')
@@ -2295,7 +2294,7 @@ def _prepare_ldflags(extra_ldflags, with_cuda, verbose, is_standalone):
             if CUDNN_HOME is not None:
                 extra_ldflags.append(f'-L{os.path.join(CUDNN_HOME, "lib64")}')
         elif IS_HIP_EXTENSION:
-            extra_ldflags.append(f'-L{_join_rocm_home("lib")}')
+            extra_ldflags.append(f'-L{_join_rocm_home("%LIB_DIR%")}')
             extra_ldflags.append('-lamdhip64')
     return extra_ldflags