Enable LWIP_NETIF_REMOVE_CALLBACK

Change-Id: I3223ef93c1f0f010476aa89d015cd9aa43552e1b
diff --git a/ports/fuchsia/include/lwipopts.h b/ports/fuchsia/include/lwipopts.h
index 7143888..176e572 100644
--- a/ports/fuchsia/include/lwipopts.h
+++ b/ports/fuchsia/include/lwipopts.h
@@ -262,6 +262,7 @@
 
 #define LWIP_NETIF_API    1
 #define LWIP_NETIF_STATUS_CALLBACK 1
+#define LWIP_NETIF_REMOVE_CALLBACK 1
 #define LWIP_NETIF_HOSTNAME 0
 
 /* ---------- SLIP options ---------- */