Fix bug #1598620: A ctypes structure cannot contain itself.

Backport from trunk.
diff --git a/Misc/NEWS b/Misc/NEWS
index 0cf1c4b..9b8fc27 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -70,6 +70,8 @@
 Extension Modules
 -----------------
 
+- Bug #1598620: A ctypes Structure cannot contain itself.
+ 
 - Bug #1588217: don't parse "= " as a soft line break in binascii's
   a2b_qp() function, instead leave it in the string as quopri.decode()
   does.