This patches fixes wrong ICMP checksum of translated packets on
big-endian machines #16715
The patch is authored by upstream author
Nathan Lutchansky <lutchann@litech.org>
Source of the patch: http://forum.mikrotik.com/viewtopic.php?f=15&t=82329
Signed-off-by: Ondrej Caletka <ondrej@caletka.cz>