vscode-extensions.rust-lang.rust-analyzer: fix keytar issue on darwin (#451992)

pkgs/applications/editors/vscode/extensions/rust-lang.rust-analyzer/default.nix

@@ -1,4 +1,5 @@
 {
+  clang_20,
   pkgsBuildBuild,
   lib,
   fetchFromGitHub,
@@ -9,7 +10,7 @@
   moreutils,
   esbuild,
   pkg-config,
-  libsecret,
+  stdenv,
   setDefaultServerPath ? true,
 }:
 
@@ -43,7 +44,9 @@ let
       esbuild
       # Required by `keytar`, which is a dependency of `vsce`.
       pkg-config
-    ];
+
+    ]
+    ++ lib.optionals stdenv.isDarwin [ clang_20 ]; # clang_21 breaks keytar
 
     # Follows https://github.com/rust-lang/rust-analyzer/blob/41949748a6123fd6061eb984a47f4fe780525e63/xtask/src/dist.rs#L39-L65
     installPhase = ''