emacs-packages: Drop irony package

Use auto-generated melpa package

pkgs/top-level/emacs-packages.nix

@@ -181,45 +181,6 @@ let
 
     icicles = callPackage ../applications/editors/emacs-modes/icicles { };
 
-    irony = melpaBuild rec {
-      pname = "irony";
-      ename = "irony";
-      version = "20190516";
-      src = fetchFromGitHub {
-        owner = "Sarcasm";
-        repo = "irony-mode";
-        rev = "c3ae899b61124a747ebafc705086345e460ac08e";
-        sha256 = "06ld83vzyklfmrfi6pp893mvlnhacv9if75c9pbipjvy6nwfb63r";
-      };
-      recipe = fetchurl {
-        url = "https://raw.githubusercontent.com/milkypostman/melpa/3cfa28c7314fa57fa9a3aaaadf9ef83f8ae541a9/recipes/irony";
-        sha256 = "1xcxrdrs7imi31nxpszgpaywq4ivni75hrdl4zzrf103xslqpl8a";
-        name = "recipe";
-      };
-      preConfigure = ''
-        cd server
-      '';
-      preBuild = ''
-        make
-      '';
-      postInstall = ''
-        mkdir -p $out
-        mv $out/share/emacs/site-lisp/elpa/*/server/bin $out
-        rm -rf $out/share/emacs/site-lisp/elpa/*/server
-      '';
-      preCheck = ''
-        cd source/server
-      '';
-      dontUseCmakeBuildDir = true;
-      doCheck = true;
-      packageRequires = [ emacs ];
-      nativeBuildInputs = [ external.cmake external.llvmPackages.llvm external.llvmPackages.clang ];
-      meta = {
-        homepage = "https://melpa.org/#/irony";
-        license = lib.licenses.gpl3;
-      };
-    };
-
     rtags = melpaBuild rec {
       pname = "rtags";
       version = "2.12";