wireshark: fix pcap-config issue

configure: error: Header file pcap.h not found; if you installed libpcap

don't use pcap. Use the internal version.

And minor configure cleanups

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>