emacs-packages: Drop redshank package

Use melpa generated package instead

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

@@ -1,23 +0,0 @@
-{ stdenv, fetchgit }:
-
-stdenv.mkDerivation rec {
-  pname = "redshank";
-  name = "${pname}-20120510";
-
-  src = fetchgit {
-    url = "http://www.foldr.org/~michaelw/projects/redshank.git";
-    rev = "f98e68f532e622bcd464292ca4a9cf5fbea14ebb";
-    sha256 = "1jdkgvd5xy9hl5q611jwah2n05abjp7qcy9sj4k1z11x0ii62b6p";
-  };
-
-  installPhase = ''
-    mkdir -p $out/share/emacs/site-lisp
-    cp *.el *.elc $out/share/emacs/site-lisp/
-  '';
-
-  meta = {
-    description = "Common Lisp Editing Extensions (for Emacs)";
-    homepage = http://www.foldr.org/~michaelw/emacs/redshank/;
-    platforms = stdenv.lib.platforms.all;
-  };
-}

pkgs/top-level/emacs-packages.nix

@@ -286,8 +286,6 @@ let
       };
     };
 
-    redshank = callPackage ../applications/editors/emacs-modes/redshank { };
-
     rtags = melpaBuild rec {
       pname = "rtags";
       version = "2.12";