fix compiler warning

--HG--
extra : transplant_source : %AE%FF9%0ALO%CE%5E%C7%93%FA%B1d%E73%E8%CA%BE%DC%C8

Cython/Utility/CythonFunction.c

@@ -809,7 +809,7 @@ static PyMemberDef __pyx_FusedFunction_members[] = {
      offsetof(__pyx_FusedFunctionObject, __signatures__),
      READONLY,
      __Pyx_DOCSTR(0)},
-    {0},
+    {0, 0, 0, 0, 0},
 };
 
 static PyMappingMethods __pyx_FusedFunction_mapping_methods = {