update lwip2 submodule tree reference

d-a-v · d-a-v · commit 91ea1f6f142d · 2017-06-19T14:06:05.000+02:00
diff --git a/Sming/third-party/lwip2 b/Sming/third-party/lwip2
@@ -1 +1 @@
-Subproject commit ec30a8e56c37eb0305dddcf60cbf0848414c8d8c
+Subproject commit 5b73bb11d59285d49a6efeb20726186cc5cc2b74
