pcap_lookupdev() is deprecated

[Ndolam]

Compiling on Slackware64 15.0

main.c: In function ‘defaults’:
main.c:73:17: warning: ‘pcap_lookupdev’ is deprecated: use 'pcap_findalldevs' and use the first device [-Wdeprecated-declarations]
73 | device = pcap_lookupdev(errbuf);
| ^~~~~~
In file included from /usr/include/pcap.h:43,
from tcptraceroute.h:38,
from main.c:23:
/usr/include/pcap/pcap.h:394:18: note: declared here
394 | PCAP_API char *pcap_lookupdev(char *)
| ^~~~~~~~~~~~~~

It compiles anyway, but just in case you wish to follow gcc's advice...