guiengine在RTT中已经淘汰了，删除这个文件，避免影响开发者

bsp/stm32/stm32f469-st-disco/applications/lcd_init.c

@@ -1,28 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2018-06-12     Tanek        first version
- */
-
-#include <rtthread.h>
-
-#if defined(PKG_USING_GUIENGINE)
-
-#include <rtgui/driver.h>
-int lcd_init(void)
-{
-    struct rt_device *device;
-    device = rt_device_find("lcd");
-    if (device)
-    {
-        rtgui_graphic_set_device(device);
-    }
-
-    return 0;
-}
-INIT_ENV_EXPORT(lcd_init);
-#endif