python312Packages.primer3: refactor

pkgs/development/python-modules/primer3/default.nix

···
     hash = "sha256-Kp4JH57gEdj7SzY+7XGBzGloWuTSwUQRBK9QbgXQfUE=";
   };
 
-  nativeBuildInputs = [
-    cython
-    setuptools
-  ] ++ lib.optionals stdenv.hostPlatform.isDarwin [ gcc ];
+  build-system = [ setuptools ];
+
+  nativeBuildInputs = [ cython ] ++ lib.optionals stdenv.hostPlatform.isDarwin [ gcc ];
 
   nativeCheckInputs = [
     click
···
     description = "Oligo analysis and primer design";
     homepage = "https://github.com/libnano/primer3-py";
     changelog = "https://github.com/libnano/primer3-py/blob/${src.tag}/CHANGES";
-    license = with licenses; [ gpl2Only ];
+    license = licenses.gpl2Only;
     maintainers = with maintainers; [ fab ];
   };
 }