lwip: Support for linux target

Implement linux port layer and reuse the original FreeRTOS layer
that's compiled and used on linux target as well, by means of FreeRTOS
simulator.

components/lwip/port/include/arpa/inet.h

@@ -0,0 +1,12 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef INET_H_
+#define INET_H_
+
+#include "lwip/inet.h"
+
+#endif /* INET_H_ */