Add some reason codes for ExitWindowsEx().
Also add EWX_FORCEIFHUNG.

diff --git a/include/winuser.h b/include/winuser.h
index 0c6c469..6cd6815 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -2526,6 +2526,7 @@
 #define EWX_REBOOT           2
 #define EWX_FORCE            4
 #define EWX_POWEROFF         8
+#define EWX_FORCEIFHUNG     16
 
 /* SetLastErrorEx types */
 #define	SLE_ERROR	0x00000001