SF patch [#466877] SIGBREAK is missing from signal module.
Patch from Steve Scott to add SIGBREAK support (unique to Windows).
diff --git a/Misc/ACKS b/Misc/ACKS
index 753aa73..19bcf2c 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -362,6 +362,7 @@
 Sam Schulenburg
 Dietmar Schwertberger
 Barry Scott
+Steven Scott
 Nick Seidenman
 Fred Sells
 Denis Severson