emacs-packages: Remove darcsum from old emacs package infrastructure

pkgs/applications/editors/emacs-modes/darcsum/darcs_context

@@ -1,7 +0,0 @@
-
-Context:
-
-[TAG 1.3
-Simon Michael <simon@joyful.com>**20131103203640
- Ignore-this: d12bac373e4aa0e5ffe6c390e1dfe269
-] 

pkgs/applications/editors/emacs-modes/darcsum/default.nix

@@ -1,34 +0,0 @@
-# To automatically load darcsum when needed, add the following to your emacs init file:
-#
-#   (autoload 'darcsum-changes "darcsum" nil t)
-#   (autoload 'darcsum-whatsnew "darcsum" nil t)
-#   (autoload 'darcsum-view "darcsum" nil t)
-#
-# (These lines were copied from 50darcsum.el in the darcsum repository.)
-
-
-{ fetchdarcs, stdenv }:
-
-stdenv.mkDerivation {
-  name = "darcsum-1.3";
-
-  src = fetchdarcs {
-    url = http://hub.darcs.net/simon/darcsum;
-    context = ./darcs_context;
-    sha256 = "18dyk2apmnjapd604a5njfqwjri1mc7lgjaajy9phicpibgdrwzh";
-  };
-
-  phases = [ "unpackPhase" "installPhase" ];
-
-  installPhase = ''
-    install -d "$out/share/emacs/site-lisp"
-    install darcsum.el "$out/share/emacs/site-lisp"
-  '';
-
-  meta = {
-    description = "A pcl-cvs like interface for managing darcs patches";
-    homepage = http://hub.darcs.net/simon/darcsum;
-    license = stdenv.lib.licenses.gpl2Plus;
-    maintainers = [ stdenv.lib.maintainers.falsifian ];
-  };
-}