emacs-packages: Remove gist from old emacs package infrastructure

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

@@ -1,36 +0,0 @@
-{ stdenv, fetchgit, emacs, gh, pcache, logito }:
-
-stdenv.mkDerivation rec {
-  name = "gist-1.0";
-
-  src = fetchgit {
-    url = "https://github.com/sigma/gist.el.git";
-    rev = "bbb457e4eaaf5f96cfaaa4f63021e3e542bfbfed";
-    sha256 = "469f9df52076d0c6038183cff4b9415bca98de66c08814a60b69729b44bdf294";
-  };
-
-  buildInputs = [ emacs ];
-
-  buildPhase = ''
-    emacs -L ${gh}/share/emacs/site-lisp \
-          -L ${pcache}/share/emacs/site-lisp \
-          -L ${logito}/share/emacs/site-lisp \
-          --eval '(setq user-emacs-directory "./")' \
-          --batch -f batch-byte-compile gist.el
-  '';
-
-  propagatedUserEnvPkgs = [ gh pcache logito ];
-
-  installPhase = ''
-    install -d $out/share/emacs/site-lisp
-    install gist.el gist.elc $out/share/emacs/site-lisp
-  '';
-
-  meta = {
-    description = "Emacs integration for gist.github.com";
-    homepage = https://github.com/sigma/gist.el;
-    license = stdenv.lib.licenses.gpl2Plus;
-
-    platforms = stdenv.lib.platforms.all;
-  };
-}