netfilter: use IS_ENABLED() macro

replace:
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
with
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)

replace:
 #if !defined(CONFIG_NF_NAT) && !defined(CONFIG_NF_NAT_MODULE)
with
 #if !IS_ENABLED(CONFIG_NF_NAT)

replace:
 #if !defined(CONFIG_NF_CONNTRACK) && !defined(CONFIG_NF_CONNTRACK_MODULE)
with
 #if !IS_ENABLED(CONFIG_NF_CONNTRACK)

And add missing:
 IS_ENABLED(CONFIG_NF_CT_NETLINK)

in net/ipv{4,6}/netfilter/nf_nat_l3proto_ipv{4,6}.c

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/net/netfilter/nf_nat_proto_common.c b/net/netfilter/nf_nat_proto_common.c
index 83a72a2..fbce552 100644
--- a/net/netfilter/nf_nat_proto_common.c
+++ b/net/netfilter/nf_nat_proto_common.c
@@ -95,7 +95,7 @@
 }
 EXPORT_SYMBOL_GPL(nf_nat_l4proto_unique_tuple);
 
-#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
 				   struct nf_nat_range *range)
 {