LWIP_ETHERNET macro

LWIP_ETHERNET==1: enable ethernet support even though ARP might be disabled

Syntax

#define LWIP_ETHERNET LWIP_ARP

Location	Text
opt.h:683	#define LWIP_ETHERNET LWIP_ARP
etharp.h:47	#if LWIP_ARP \|\| LWIP_ETHERNET /* don't build if not configured for use in lwipopts.h */
ethernet.c:43	#if LWIP_ARP \|\| LWIP_ETHERNET
ethernet.h:54	#if LWIP_ARP \|\| LWIP_ETHERNET
init.c:223	#if !LWIP_ETHERNET && (LWIP_ARP \|\| PPPOE_SUPPORT)
netif.c:224	#if LWIP_ETHERNET
tcpip.c:285	#if LWIP_ETHERNET