With this change, the comment at wiretap/libpcap.c:769 is stale since it still references 64KB. Not a major issue, but makes me wonder where else in the code we've accidentally hardcoded that assumption... I guess we'll find out :)
Libpcap 1.6/tcpdump 4.6 will support up to 131072, as the MTU on the
Linux loopback device is 65536 on at least some versions of the kernel,
and that doesn't count the fake Ethernet header, so the maximum packet
size is 65549; they went to the next power of 2 up.