starship: fix build on Darwin (#540463)

pkgs/by-name/st/starship/package.nix

@@ -3,6 +3,7 @@
   stdenv,
   fetchFromGitHub,
   rustPlatform,
+  llvmPackages,
   installShellFiles,
   writableTmpDirAsHomeHook,
   gitMinimal,
@@ -22,13 +23,24 @@ rustPlatform.buildRustPackage (finalAttrs: {
     hash = "sha256-pStNE8SMMVavL3ld6RO+5QQRJPXpqlU3asccS2tUoMQ=";
   };
 
-  nativeBuildInputs = [ installShellFiles ];
+  nativeBuildInputs = [
+    installShellFiles
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [ llvmPackages.lld ];
 
   buildInputs = lib.optionals (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64) [
     writableTmpDirAsHomeHook
   ];
 
-  env.TZDIR = "${tzdata}/share/zoneinfo";
+  env = {
+    TZDIR = "${tzdata}/share/zoneinfo";
+  }
+  // lib.optionalAttrs stdenv.hostPlatform.isDarwin {
+    # Work around ld64's libc++ hardening issue.
+    #
+    # TODO: Remove once #536365 reaches this branch.
+    NIX_CFLAGS_LINK = "-fuse-ld=lld";
+  };
 
   postInstall = ''
     presetdir=$out/share/starship/presets/