emacsPackages.age: replace program (#343569)

        # Expects bash to be at /bin/bash

        ac-rtags = fix-rtags super.ac-rtags;

        age = super.age.overrideAttrs (attrs: {

          postPatch = attrs.postPatch or "" + ''

            substituteInPlace age.el \

              --replace-fail 'age-program (executable-find "age")' 'age-program "${lib.getExe pkgs.age}"'

          '';

        });

        airline-themes = super.airline-themes.override {

          inherit (self.melpaPackages) powerline;

        };