xtables-addons: bump 3.30 and fix LUA build on 6.18

xtables-addons: bump 3.30 and fix LUA build on 6.18

This upstream release allows clean builds against linux 6.18. Fix LUA
PacketScript build on 6.18 by switching to ccflags-y and restoring the
required -isystem include path. Remove compat_xtables since the module
no longer exists in 3.30 and drop all dependent kmod references.

Fix CI build failure with backport:
600-xt_pknock-fox-do_div-signness-mismatch.patch

Note that upstream tarball changed from xz to zst.

Signed-off-by: John Audia <redacted>