lwip/tcp.c: remove unused and duplicated code #906
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tcp_abandon() calls tcp_pcb_remove() which calls tcp_pcb_purge(). Since
we can abandon only non LISTEN sockets, all segments lists are
guaranteed to be empty after tcp_pcb_remove(). Checking them is an
extra code.
external_ip_output() is not used anywhere and the code around this
function is dead.