Don't require DeviceTopologyAmd to be present

pyopencl/__init__.py

@@ -51,7 +51,7 @@ import sys
 
 _PYPY = "__pypy__" in sys.builtin_module_names
 
-from pyopencl._cl import (  # noqa
+from pyopencl._cl import (  # noqa: F401
         get_cl_header_version,
         program_kind,
         status_code,
@@ -148,9 +148,13 @@ from pyopencl._cl import (  # noqa
 
         Image,
         Sampler,
-        DeviceTopologyAmd,
         )
 
+try:
+    from pyopencl._cl import DeviceTopologyAmd  # noqa: F401
+except ImportError:
+    pass
+
 if not _PYPY:
     # FIXME: Add back to default set when pypy support catches up
     from pyopencl._cl import (  # noqa