libpcap: Update to 1.10.3

Local changes:

- In contrib/libpcap/pcap/bpf.h, do not include pcap/dlt.h. Our system
net/dlt.h is pulled in from net/bpf.h.
- sys/net/dlt.h: Incorporate changes from l

libpcap: Update to 1.10.3

Local changes:

- In contrib/libpcap/pcap/bpf.h, do not include pcap/dlt.h. Our system
net/dlt.h is pulled in from net/bpf.h.
- sys/net/dlt.h: Incorporate changes from libpcap 1.10.3.
- lib/libpcap/Makefile: Update for libpcap 1.10.3.

Changelog: https://git.tcpdump.org/libpcap/blob/95691ebe7564afa3faa5c6ba0dbd17e351be455a:/CHANGES
Reviewed by: emaste
Obtained from: https://www.tcpdump.org/release/libpcap-1.10.3.tar.gz
Sponsored by: The FreeBSD Foundation

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