sysutils/syslinux update

[Boris Samorodov]

Hi All,

I've opened a PR to update sysutils/syslinux to a new version.
If someone is interested in using this update, please give it
a try. A followup to the PR is appreciated:
http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/141166

There are some code changes. As for me I use only pxelinux from
this port (it's a binary only file). So I can't test code changes.
Thanks.

-- 
WBR, Boris Samorodov (bsam)
Research Engineer, http://www.ipt.ru Telephone & Internet SP
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve