python3Packages.johnnycanencrypt: fix build with newer maturin

pkgs/development/python-modules/johnnycanencrypt/default.nix

···
 , pytestCheckHook
 , pythonOlder
 , PCSC
+, libiconv
 }:
 
 buildPythonPackage rec {
···
   buildInputs = [
     pcsclite
     nettle
-  ] ++ lib.optionals stdenv.isDarwin [ PCSC ];
+  ] ++ lib.optionals stdenv.isDarwin [
+    PCSC
+    libiconv
+  ];
 
   # Needed b/c need to check AFTER python wheel is installed (using Rust Build, not buildPythonPackage)
   doCheck = false;
···
   # for compatibility with maturin 0.9.0.
   postPatch = ''
     sed '/project-url = /d' -i Cargo.toml
+    substituteInPlace pyproject.toml \
+      --replace 'manylinux = "off"' 'skip-auditwheel = true'
   '';
 
   preCheck = ''