fix the -lpcap problem
fix the -lpcap problem

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