add dependency - libpcap 1.5.3 sources
add example - build packet processor using static linkage

the server environment only offers an old version of glibc
(can not be replaced) so beside the static linking a wrapper
to memcpy is needed (now-days systems offer memcpy@GLIBC_2.14
but only 2.2.5 is available on the server)
add small sample pcaps

libpcap works with pcap and pcapng
ignore everything within the build dir
add build dir