Implement PEP 3121: new module initialization and finalization API.
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index aef0f94..0c9c94d 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -1799,7 +1799,7 @@
 #endif
 
 
-PyMODINIT_FUNC
+void
 _PyExc_Init(void)
 {
     PyObject *bltinmod, *bdict;