Update libpcap to upstream release 1.8.1
Change the name from libpcap.so.1.3 to libpcap.so.1
Remove parts of patch 201 which moved code among src files.
Import patch 204 from Debian to update the USB path.

Signed-off-by: Paul Wassi <p.wassi@gmx.at>
Signed-off-by: Felix Fietkau <nbd@nbd.name> [fix parallel build bug]