package: add ndisc6 (IPv6 network tools)

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/package/Config.in b/package/Config.in
index 28a08d2..a310146 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -483,6 +483,7 @@
 source "package/mutt/Config.in"
 source "package/nbd/Config.in"
 source "package/ncftp/Config.in"
+source "package/ndisc6/Config.in"
 if BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
 source "package/netcat/Config.in"
 source "package/netkitbase/Config.in"