Hack references to get the linker using the open lib definitions.

open_esplibs/libnet80211/ieee80211_hostap.c

@@ -28,4 +28,7 @@ void sdk_hostap_handle_timer(struct sdk_netif_conninfo *cnx_node)
     }
 }
 
+/* Needed to have the linker actually replace the above definitions. */
+void libnet80211_hostap_linker_hack(){}
+
 #endif /* OPEN_LIBNET80211_HOSTAP */

open_esplibs/libnet80211/wl_cnx.c

@@ -31,4 +31,7 @@ void *sdk_cnx_node_search(uint8_t mac[6])
     return NULL;
 }
 
+/* Needed to have the linker actually replace the above definitions. */
+void libnet80211_wl_cnx_linker_hack(){}
+
 #endif /* OPEN_LIBNET80211_WL_CNX */