comctl32: add missing prototype

[Austin English]

-- 
-Austin
-------------- next part --------------
diff --git a/dlls/comctl32/toolbar.c b/dlls/comctl32/toolbar.c
index d95dc7d..d05a40d 100644
--- a/dlls/comctl32/toolbar.c
+++ b/dlls/comctl32/toolbar.c
@@ -6434,7 +6434,7 @@ TOOLBAR_StyleChanged (TOOLBAR_INFO *infoPtr, INT nType, const STYLESTRUCT *lpSty
 
 
 static LRESULT
-TOOLBAR_SysColorChange ()
+TOOLBAR_SysColorChange (void)
 {
     COMCTL32_RefreshSysColors();