Add PyType_GetSlot to python3 def file.  Patch courtesy Martin v. Löwis.
diff --git a/PC/python34stub.def b/PC/python34stub.def
index 4628cdc..3074cf3 100644
--- a/PC/python34stub.def
+++ b/PC/python34stub.def
@@ -518,6 +518,7 @@
 PyType_GenericAlloc
 PyType_GenericNew
 PyType_GetFlags
+PyType_GetSlot
 PyType_IsSubtype
 PyType_Modified
 PyType_Ready