subxt: fix build on darwin

pkgs/development/tools/subxt/default.nix

@@ -3,6 +3,7 @@
 , rustPlatform
 , fetchFromGitHub
 , cmake
+, darwin
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -24,6 +25,10 @@ rustPlatform.buildRustPackage rec {
   # Needed by wabt-sys
   nativeBuildInputs = [ cmake ];
 
+  buildInputs = lib.optionals stdenv.isDarwin [
+    darwin.apple_sdk.frameworks.Security
+  ];
+
   # Requires a running substrate node
   doCheck = false;