unar: move to pkgs/by-name

this shouldn't create any rebuilds

pkgs/by-name/un/unar/package.nix

@@ -1,6 +1,6 @@
 {
   lib,
-  stdenv,
+  clangStdenv,
   fetchFromGitHub,
   installShellFiles,
   gnustep-base,
@@ -11,7 +11,9 @@
   wavpack,
   xcbuildHook,
 }:
-
+let
+  stdenv = clangStdenv;
+in
 stdenv.mkDerivation rec {
   pname = "unar";
   version = "1.10.8";

pkgs/top-level/all-packages.nix

@@ -3761,10 +3761,6 @@ with pkgs;
     inherit (chickenPackages_4) eggDerivation fetchegg;
   };
 
-  unar = callPackage ../tools/archivers/unar {
-    stdenv = clangStdenv;
-  };
-
   unzipNLS = lowPrio (unzip.override { enableNLS = true; });
 
   inherit (callPackages ../servers/varnish { })