Added SS_ENDELLIPSIS.

diff --git a/include/winuser.h b/include/winuser.h
index bb8bf04..7b93b88 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -2060,6 +2060,7 @@
 #define SS_RIGHTJUST        0x00000400L
 #define SS_REALSIZEIMAGE    0x00000800L
 #define SS_SUNKEN           0x00001000L
+#define SS_ENDELLIPSIS      0x00004000L
 
 /* Static Control Messages */
 #define STM_SETICON       0x0170