remove the retransmission of the first syn packet
remove the retransmission of the first syn packet

u20024804/tcpcopy,horryq/tcpcopy,horryq/tcpcopy,wfxiang08/tcpcopy,liviusATnetskope/second,sshling/tcpcopy,wfxiang08/tcpcopy,left2right/tcpcopy,daodaoliang/tcpcopy,ycaihua/tcpcopy,eliteYang/tcpcopy,ycaihua/tcpcopy,u20024804/tcpcopy,liviusATnetskope/second,daodaoliang/tcpcopy,sshling/tcpcopy,left2right/tcpcopy,caosiyang/tcpcopy,eliteYang/tcpcopy,caosiyang/tcpcopy