teach tcpdump about the LLDP_Multicast group

[David Gwynne]

ok?

Index: addrtoname.c
===================================================================
RCS file: /cvs/src/usr.sbin/tcpdump/addrtoname.c,v
retrieving revision 1.38
diff -u -p -r1.38 addrtoname.c
--- addrtoname.c        22 Oct 2018 16:12:45 -0000      1.38
+++ addrtoname.c        20 Dec 2018 03:00:42 -0000
@@ -737,6 +737,7 @@ static struct etherlist {
        char *name;
 } etherlist[] = {
        {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
+       {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x0e }, "LLDP_Multicast" },
        {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 };