fix struct sockaddr version check

* sa_data_min field was introduced on v5.15.150, removed on v5.16 and
  reintroduced on v6.1.80

fix struct sockaddr version check

* sa_data_min field was introduced on v5.15.150, removed on v5.16 and
  reintroduced on v6.1.80

adjust copyright year

add support for setting skb->mark on luanetfilter

* while here doing a little refactoring

adjust copyright year

bump Lunatik version to 3.6

get rid of loop initial declarations to support gnu89

Revert "disable UBSAN_SANITIZE"

This reverts commit 28d48bd.

* doesn't need anymore because of dfc1467 (/lua)

bump lunatik version to 3.4