locate.nix: Don't create /var/cache
locate.nix: Don't create /var/cache

Fixes

  setting up tmpfiles
  [/etc/tmpfiles.d/var.conf:19] Duplicate line for path "/var/cache", ignoring.

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