reenable ARP queuing in lwip2 by courtesy of @aboulfad #5978
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refs:
fix #5955
fix #3481 (first packet lost in a row of 4 - need to increase lwIP's
ARP_QUEUE_LEN
which defaults to 3)Thanks @aboulfad !
(it was removed by error on 9 oct 2018 a1e59e9#diff-8a46852651388faec204ec21c86b8098L586)