SF patch  522961: Leak in Python/thread_nt.h, from Gerald S. Williams.
A file-static "threads" dict mapped thread IDs to Windows handles, but
was never referenced, and entries never got removed.  This gets rid of
the YAGNI-dict entirely.
Bugfix candidate.
diff --git a/Misc/ACKS b/Misc/ACKS
index 1646fe0..9a49b86 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -474,6 +474,7 @@
 Truida Wiedijk
 Gerry Wiener
 Bryce "Zooko" Wilcox-O'Hearn
+Gerald S. Williams
 Sue Williams
 Frank Willison
 Greg V. Wilson