final patches from Neil Schemenauer for garbage collection
diff --git a/Modules/Setup.thread.in b/Modules/Setup.thread.in
index d532156..7360144 100644
--- a/Modules/Setup.thread.in
+++ b/Modules/Setup.thread.in
@@ -10,3 +10,6 @@
 # support threads.
 
 @USE_THREAD_MODULE@thread threadmodule.c
+
+# Garbage collection enabled with --with-cycle-gc
+@USE_GC_MODULE@gc gcmodule.c