Link issue in Ubuntu 14.04 LTS

[John Messenger]

The pcap library is included using AM_LDFLAGS. That variable is included early in the "ld" line, before the *.o files. In Ubuntu 14.04 LTS and perhaps other environments, the libraries have to be after the *.o files in order to be searched for required entrypoints. If pcap is included in LIBS instead, it works.