less: 483 -> 481: Use recommended upstream version since less-483.tar.gz has disappeared
less: 483 -> 481: Use recommended upstream version since less-483.tar.gz has disappeared

This is a fix for the current package source file
  http://www.greenwoodsoftware.com/less/less-483.tar.gz
not being available anymore.

We bump the less version back to 481, and adjust the source package hash
accordingly. This is a (slight) downgrade from 483 as opposed to an
upgrade since
  a) 481 is the current Recommended version by http://www.greenwoodsoftware.com/less/download.html
  b) Upstream is unreliable about keeping experimental versions around.

NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs