vnote: fix by using qt's mkDerivation, 2.6 -> 2.7.2
vnote: fix by using qt's mkDerivation, 2.6 -> 2.7.2

https://github.com/tamlok/vnote/releases/tag/v2.7.2
https://github.com/tamlok/vnote/releases/tag/v2.7.1
https://github.com/tamlok/vnote/releases/tag/v2.7

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