Based on the previous patch comments, some changes were made to make it more
nuttx style.
https://github.com/apache/nuttx-apps/pull/1829
Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
Add xtables.c and xtables.h
In order to support the compilation of third-party utils, we encounter some
situations where the macro is not defined, refer to the common implementation
of other systems, add relevant definitions and empty function.
Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>