MFC r293190: MFV r293125: less v481.

Relnotes: yes

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

This commit was generated by cvs2svn to compensate for changes in r60786,
which included commits to RCS files with non-trunk default branches.

Import the [now] dual licensed version 3.5.4 of less. It is
distributed under your choice of the GPL or a BSD style license.

Reviewed by: peter
Obtained from: http://home.flash.net/~marknu/less/