netfilter: Always export nf_connlabels_replace()

The following patches will reuse this code from OVS.
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/nf_conntrack_labels.c

@@ -48,7 +48,6 @@ int nf_connlabel_set(struct nf_conn *ct, u16 bit)
 }
 EXPORT_SYMBOL_GPL(nf_connlabel_set);
 
-#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 static void replace_u32(u32 *address, u32 mask, u32 new)
 {
 	u32 old, tmp;
@@ -89,7 +88,6 @@ int nf_connlabels_replace(struct nf_conn *ct,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nf_connlabels_replace);
-#endif
 
 static struct nf_ct_ext_type labels_extend __read_mostly = {
 	.len    = sizeof(struct nf_conn_labels),