Status bars on managed windows should not have SIZEGRIP style.

diff --git a/include/winuser.h b/include/winuser.h
index c1f2796..1035329 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -2441,6 +2441,7 @@
 
 /* WINE internal... */
 #define WS_EX_TRAYWINDOW	0x80000000L
+#define WS_EX_MANAGED		0x40000000L /* Window managed by the window system */
 
 /* Window scrolling */
 #define SW_SCROLLCHILDREN      0x0001