m_xt: stop using xtables_set_revision()

iptables dropped the xtables_set_revision() function around version 1.4.9,
so set the rev directly ourselves.  This should be compatible back to the
original version m_xt itself is designed for.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

tc/m_xt.c

@@ -88,7 +88,7 @@ build_st(struct xtables_target *target, struct xt_entry_target *t)
 		target->t = xtables_calloc(1, size);
 		target->t->u.target_size = size;
 		strcpy(target->t->u.user.name, target->name);
-		xtables_set_revision(target->t->u.user.name, target->revision);
+		target->t->u.user.revision = target->revision;
 
 		if (target->init != NULL)
 			target->init(target->t);