Fix ip4 loopback when LWIP_SINGLE_NETIF si used #45
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When LWIP_SINGLE_NETIF is used, LWIP_NETIF_LOOPBACK case is not managed at all in the ip4_route() function. Consequently any ip4 loopback packet is rejected. This adds the required code to fix this.
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When LWIP_SINGLE_NETIF is used, LWIP_NETIF_LOOPBACK case is not managed at all in the ip4_route() function. Consequently any ip4 loopback packet is rejected.
This adds the required code to fix this.