Remove ability to compile without IPv6 support.

This was the source of a large number of #ifdefs, originally
included for use with old embedded libc versions. I'm
sure no-one wants or needs IPv6-free code these days, so this
is a move towards more maintainable code.

src/tables.c

@@ -108,7 +108,7 @@ int add_to_ipset(const char *setname, const struct all_addr *ipaddr,
     my_syslog(LOG_INFO, _("info: table created"));
  
   bzero(&addr, sizeof(addr));
-#ifdef HAVE_IPV6
+
   if (flags & F_IPV6) 
     {
       addr.pfra_af = AF_INET6;
@@ -116,7 +116,6 @@ int add_to_ipset(const char *setname, const struct all_addr *ipaddr,
       memcpy(&(addr.pfra_ip6addr), &(ipaddr->addr), sizeof(struct in6_addr));
     } 
   else 
-#endif
     {
       addr.pfra_af = AF_INET;
       addr.pfra_net = 0x20;