use the new threading properties for multiprocessing (reviewed by Jesse #3927)

Lib/multiprocessing/dummy/__init__.py

@@ -54,12 +54,6 @@ class DummyProcess(threading.Thread):
         else:
             return None
 
-    is_alive = threading.Thread.is_alive.im_func
-    get_name = threading.Thread.getName.im_func
-    set_name = threading.Thread.setName.im_func
-    is_daemon = threading.Thread.isDaemon.im_func
-    set_daemon = threading.Thread.setDaemon.im_func
-
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