update contrib/less to 436

[Jan Lentfer]

The relvant diff against master and for vendor/LESS can be found here:
http://leaf.dragonflybsd.org/~lentferj/

The repo is at
http://gitweb.dragonflybsd.org/~lentferj/dragonfly.git

branches less_update and vendor/LESS.

Regards,

JAn