Use GetTickCount() instead of GetMessageTime().

The latter would be imprecise and depend on the VM receiving real MSG messages at the same time.

platforms/win32/vm/sqWin32Window.c

@@ -1269,7 +1269,7 @@ int recordDragDropEvent(HWND wnd, int dragType, int x, int y, int numFiles)
   /* first the basics */
   evt->type = EventTypeDragDropFiles;
   // Be consistent with tagMSG.time source which is recorded for mouse events
-  evt->timeStamp = GetMessageTime();
+  evt->timeStamp = GetTickCount();
   evt->dragType = dragType;
   evt->x = x;
   evt->y = y;