Backport of r60190:
- Fix Issue #1703448: A joined thread could show up in the
  threading.enumerate() list after the join() for a brief period until
  it actually exited.
diff --git a/Misc/NEWS b/Misc/NEWS
index dd06f60..1fa60b0 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -55,6 +55,10 @@
 
 - Bug #1733488: Fix compilation of bufferobject.c on AIX.
 
+- Fix Issue #1703448: A joined thread could show up in the
+  threading.enumerate() list after the join() for a brief period until
+  it actually exited.
+
 
 Library
 -------