IPaddress common control implementation. First try; needs more work to
remove boring bugs.

diff --git a/include/commctrl.h b/include/commctrl.h
index 4c91919..3a2408a 100644
--- a/include/commctrl.h
+++ b/include/commctrl.h
@@ -2468,7 +2468,9 @@
 #define IPM_SETFOCUS		(WM_USER+104)
 #define IPM_ISBLANK		(WM_USER+105)
 
-#define IPN_FIELDCHANGED	(IPN_FIRST-0)
+#define IPN_FIRST               (0U-860U)
+#define IPN_LAST                (0U-879U)
+#define IPN_FIELDCHANGED    (IPN_FIRST-0)
 
 typedef struct tagNMIPADDRESS
 {