Bug #1566280: Explicitly invoke threading._shutdown from Py_Main,
to avoid relying on atexit.
Will backport to 2.5.
diff --git a/Misc/NEWS b/Misc/NEWS
index 4f310d8..972f1e0 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and builtins
 -----------------
 
+- Bug #1566280: Explicitly invoke threading._shutdown from Py_Main,
+  to avoid relying on atexit.
+
 - Bug #1590891: random.randrange don't return correct value for big number
 
 - Patch #1586791: Better exception messages for some operations on strings,