link: add support for IFLA_CARRIER_CHANGES

Also expose the attribute value via link_dump_details()

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
diff --git a/libnl-route-3.sym b/libnl-route-3.sym
index f1a048c..b80c1f8 100644
--- a/libnl-route-3.sym
+++ b/libnl-route-3.sym
@@ -958,6 +958,7 @@
 	rtnl_link_bridge_set_hwmode;
 	rtnl_link_bridge_hwmode2str;
 	rtnl_link_bridge_str2hwmode;
+	rtnl_link_get_carrier_changes;
 	rtnl_link_ipgre_get_pmtudisc;
 	rtnl_link_is_ipgretap;
 	rtnl_link_macvlan_add_macaddr;