Remove obsolete flycheck version.

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

@@ -1,32 +0,0 @@
-{ stdenv, fetchFromGitHub, emacs, let-alist, dash, texinfo }:
-
-stdenv.mkDerivation rec {
-  name = "flycheck-0.22-64-g90dbc2d";
-
-  src = fetchFromGitHub {
-    owner = "flycheck";
-    repo = "flycheck";
-    rev = "90dbc2d";
-    sha256 = "08bg4jps6hjldbcrvqarrwdv4xzirm5pns5s0331wm0sc47yvbli";
-  };
-
-  buildInputs = [ emacs texinfo ];
-
-  buildPhase = ''
-    emacs -L ${let-alist}/share/emacs/site-lisp -L ${dash}/share/emacs/site-lisp --batch -f batch-byte-compile flycheck.el
-    makeinfo --force --no-split -o doc/flycheck.info doc/flycheck.texi
-  '';
-
-  installPhase = ''
-    mkdir -p $out/share/emacs/site-lisp $out/share/info
-    mv flycheck.el flycheck.elc $out/share/emacs/site-lisp/
-    mv "doc/"*.info $out/share/info/
-  '';
-
-  meta = {
-    inherit (src.meta) homepage;
-    description = "Modern on-the-fly syntax checking for GNU Emacs";
-    license = stdenv.lib.licenses.gpl3Plus;
-    maintainers = with stdenv.lib.maintainers; [ simons ];
-  };
-}

pkgs/top-level/all-packages.nix

@@ -12262,8 +12262,6 @@ in
 
     ess = callPackage ../applications/editors/emacs-modes/ess { };
 
-    flycheck = callPackage ../applications/editors/emacs-modes/flycheck { };
-
     flymakeCursor = callPackage ../applications/editors/emacs-modes/flymake-cursor { };
 
     gh = callPackage ../applications/editors/emacs-modes/gh { };