python312Packages.cgal: unbreak on Darwin

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

···
     homepage = "https://github.com/CGAL/cgal-swig-bindings";
     license = lib.licenses.gpl3Plus;
     maintainers = with lib.maintainers; [ pbsds ];
-    # error: no template named 'unary_function' in namespace 'boost::functional::detail'
-    broken = stdenv.hostPlatform.isDarwin;
   };
 }