Revert "Remove netcfg's unused options."

This reverts commit f8e83054cb8a8b13ee84a4aeeaa0a2fd8debca81.

Change-Id: Iede772f96ff9008277df433dcbb5f6603de65283
diff --git a/include/netutils/ifc.h b/include/netutils/ifc.h
index 49e77e4..3b27234 100644
--- a/include/netutils/ifc.h
+++ b/include/netutils/ifc.h
@@ -51,6 +51,7 @@
 extern int ifc_clear_addresses(const char *name);
 
 extern int ifc_create_default_route(const char *name, in_addr_t addr);
+extern int ifc_remove_default_route(const char *ifname);
 extern int ifc_get_info(const char *name, in_addr_t *addr, int *prefixLength,
                         unsigned *flags);