Merge pull request #172204 from WolfangAukang/uharfbuzz-darwin

python3Packages.uharfbuzz: mark as broken on darwin

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

···
 { lib
+, stdenv
 , buildPythonPackage
 , fetchFromGitHub
 , pythonOlder
···
     homepage = "https://github.com/harfbuzz/uharfbuzz";
     license = licenses.asl20;
     maintainers = with maintainers; [ wolfangaukang ];
+    broken = stdenv.isDarwin;
   };
 }