ocamlPackages.cpu: use Dune 2

+2
+2
pkgs/development/ocaml-modules/cpu/default.nix
··· 4 pname = "cpu"; 5 version = "2.0.0"; 6 7 src = fetchFromGitHub { 8 owner = "UnixJunkie"; 9 repo = pname;
··· 4 pname = "cpu"; 5 version = "2.0.0"; 6 7 + useDune2 = true; 8 + 9 src = fetchFromGitHub { 10 owner = "UnixJunkie"; 11 repo = pname;