Add ESP8266 example

src/arch_esp8266.h

@@ -3,25 +3,10 @@
 #if MG_ARCH == MG_ARCH_ESP8266
 
 #include <dirent.h>
+#include <esp_system.h>
+#include <netdb.h>
 #include <stdbool.h>
 #include <sys/time.h>
-#include <user_interface.h>
-
 #define MG_DIRSEP '/'
-#ifndef PATH_MAX
-#define PATH_MAX 128
-#endif
-#define MG_ENABLE_LWIP 1
-#define LWIP_TIMEVAL_PRIVATE 0  // struct timeval is defined in sys/time.h
-
-#if LWIP_SOCKET
-#include <lwip/sockets.h>
-#else
-#undef LWIP_SOCKET
-#define LWIP_SOCKET 1
-#include <lwip/sockets.h>  // Source sockaddr_in anyway
-#undef LWIP_SOCKET
-#define LWIP_SOCKET 0
-#endif
 
 #endif