Support route deletion entries in SVP_R_LOG_ACK.

@@ -53,6 +53,7 @@
         libvarpd_prop_set_type          { FLAGS = EXTERN };
         libvarpd_prop_set_default       { FLAGS = EXTERN };
         libvarpd_prop_set_nodefault     { FLAGS = EXTERN };
         libvarpd_prop_set_range_uint32  { FLAGS = EXTERN };
         libvarpd_prop_set_rangestr      { FLAGS = EXTERN };
+        libvarpd_route_flush            { FLAGS = EXTERN };
 };