SDL_windowsmessagebox.c: remove unused variable
diff --git a/src/video/windows/SDL_windowsmessagebox.c b/src/video/windows/SDL_windowsmessagebox.c
index 7615ee6..0501fd9 100644
--- a/src/video/windows/SDL_windowsmessagebox.c
+++ b/src/video/windows/SDL_windowsmessagebox.c
@@ -547,7 +547,6 @@
 {
     WIN_DialogData *dialog;
     int i, x, y, retval;
-    const SDL_MessageBoxButtonData *buttons = messageboxdata->buttons;
     HFONT DialogFont;
     SIZE Size;
     RECT TextSize;