Jose Luis Duran 6d33121337 ping: Remove ifndef icmp_data guards
Early versions of <netinet/ip_icmp.h> [1] did not have icmp_data
defined, but FreeBSD has always had.  Remove these guards.

NetBSD [2] and OpenBSD [3] have already removed them.

[1]: https://www.tuhs.org/cgi-bin/utree.pl?file=4.2BSD/usr/src/sys/netinet/ip_icmp.h
[2]: 203dfd3486
[3]: d83449c83c

Reviewed by:	markj
MFC after:	1 week
2023-03-14 11:58:03 -04:00
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