sbclPackages.cl-project: add skeleton.asd to output (#363325)

      cl-liballegro-nuklear = build-with-compile-into-pwd super.cl-liballegro-nuklear;

      cl-project = super.cl-project.overrideLispAttrs {

        # install skeleton.asd

        postInstall = ''

          cp -v skeleton/skeleton.asd $out/skeleton

        '';

      };

      lessp = build-asdf-system {

        pname = "lessp";

        version = "0.2-f8a9e4664";