netfilter: xt_SECMARK: add new revision to fix structure layout

This extension breaks when trying to delete rules, add a new revision to
fix this.

Fixes: 5e6874cd

 ("[SECMARK]: Add xtables SECMARK target")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>