[IPV6] ADDRCONF: Statically link __ipv6_addr_type() for sunrpc subsystem.

Link __ipv6_addr_type() statically for sunrpc code even if IPv6 is
built as module.

Signed-off-by: YOSHIFUJI Hidaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 8bacda1..d460017 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -32,6 +32,6 @@
 obj-$(CONFIG_IPV6_SIT) += sit.o
 obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o
 
-obj-y += exthdrs_core.o
+obj-y += addrconf_core.o exthdrs_core.o
 
 obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o