Implement #8521. Added named argument handling to winreg's CreateKeyEx,
DeleteKeyEx, and OpenKeyEx.

Note that CKE and DKE are new functions for 3.2 so I didn't give them a
versionchanged because of the existing versionadded. OpenKeyEx already
existed so it gets a versionchanged tag.
diff --git a/Misc/NEWS b/Misc/NEWS
index 2fb3b95..4bfd534 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #8521: Allow CreateKeyEx, OpenKeyEx, and DeleteKeyEx functions
+  of winreg to use named arguments.
+
 - Issue #9930: Remove bogus subtype check that was causing (e.g.)
   float.__rdiv__(2.0, 3) to return NotImplemented instead of the
   expected 1.5.