bpo-33542: Ignore DUID in uuid.get_node on Windows. (GH-6922)

uuid._ipconfig_getnode did not validate the maximum length of the value,
so long as the value had the same type of formatting as a MAC address.
This let it select DUIDs as MAC addresses. It now requires an exact
length match.
diff --git a/Misc/ACKS b/Misc/ACKS
index b1f1e8a..cb7f4cd 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -428,6 +428,7 @@
 David Edelsohn
 John Edmonds
 Grant Edwards
+Zvi Effron
 John Ehresman
 Tal Einat
 Eric Eisner