Fix lost export-dynamic

get_link_kind() fails for statically linked modules (vlan, veth, etc.) if "ip"
was linked without "export-dynamic".
Signed-off-by: Vitaliy Gusev <vgusev@openvz.org>

--
Thank,
Vitaliy Gusev
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

ip/Makefile

@@ -24,3 +24,5 @@ clean:
 	rm -f $(ALLOBJ) $(TARGETS)
 
 LDLIBS += -ldl
+
+LDFLAGS += -Wl,-export-dynamic