Silence all exceptions from `import ctypes` to match behaviour

of the standard Python uuid module, and avoid passing on MemoryError
exceptions on SELinux-enabled systems.

Closes #52.  Closes #53

kombu/utils/__init__.py

@@ -5,7 +5,7 @@ from uuid import UUID, uuid4 as _uuid4, _uuid_generate_random
 
 try:
     import ctypes
-except ImportError:
+except:
     ctypes = None  # noqa