fix sendpacket.c compile issue for libpcap/linux

[aturner]

 <jevere> I found a compilation error
[09:58]  <jevere> at src/common/sendpacket.c
[09:59]  <jevere> this patch solves it
[09:59]  <jevere> Index: src/common/sendpacket.c
[09:59]  <jevere> ===================================================================
[09:59]  <jevere> --- src/common/sendpacket.c     (revision 2065)
[09:59]  <jevere> +++ src/common/sendpacket.c     (working copy)
[09:59]  <jevere> @@ -412,9 +412,9 @@
[09:59]  <jevere>  #ifdef HAVE_LIBDNET
[09:59]  <jevere>      eth_close(sp->handle.ldnet);
[09:59]  <jevere>  #elif defined HAVE_LIBPCAP
[09:59]  <jevere> -    pcap_close(sp->pcap);
[09:59]  <jevere> +    pcap_close(sp->handle.pcap);
[09:59]  <jevere>  #else
[09:59]  <jevere> -    close(sp->fd);
[10:00]  <jevere> +    close(sp->handle.fd);
[10:00]  <jevere>  #endif
[10:00]  <jevere>      safe_free(sp);
[10:00]  <jevere>      return 0;

[aturner]

(In [2066]) fix compile issue. fixes #326