SF bug #130306:  statcache.py full of thread problems.
Fixed the thread races.  Function forget_dir was also utterly Unix-specific.
diff --git a/Misc/ACKS b/Misc/ACKS
index 554203f..12a1f99 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -197,6 +197,7 @@
 Bob Kahn
 Tamito Kajiyama
 Lou Kates
+Randall Kern
 Magnus Kessler
 Lawrence Kesteloot
 Vivek Khera