test_threading now skips testing alternate thread stack sizes on
platforms that don't support changing thread stack size.
diff --git a/Misc/NEWS b/Misc/NEWS
index 95b2d4e..04549b9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -53,6 +53,9 @@
 
 - Bug #1535182: really test the xreadlines() method of bz2 objects.
 
+- test_threading now skips testing alternate thread stack sizes on
+  platforms that don't support changing thread stack size.
+
 
 Documentation
 -------------