Add missing darwin build dependency (#286)

Author: voidcontext

flake.nix

@@ -27,7 +27,7 @@
           };
           nativeBuildInputs = [ pkg-config ];
           buildInputs = [ openssl ] ++ lib.optionals stdenv.isDarwin
-            (with darwin.apple_sdk.frameworks; [ AppKit Security ]);
+            (with darwin.apple_sdk.frameworks; [ AppKit Security Cocoa]);
         };
 
         devShell = mkShell {