Patch porting gcc v2 (#124)

* 更改编译器的Include路径，使得include时不需要加`<libc/src/include/>`前缀

* 修改include路径

Co-authored-by: longjin <longjin@RinGoTek.cn>

user/apps/shell/cmd_help.c

@@ -1,6 +1,7 @@
 #include "cmd_help.h"
-#include <libc/src/stdio.h>
-#include <libc/src/stdlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+
 struct help_table_item_t
 {
     void (*func)();