xmldiff: use toPythonApplication instead of redefining the whole package (#534178)

pkgs/by-name/xm/xmldiff/package.nix

@@ -1,45 +1,3 @@
-{
-  lib,
-  python3,
-  fetchFromGitHub,
-}:
+{ python3Packages }:
 
-let
-  version = "2.6.3";
-  src = fetchFromGitHub {
-    owner = "Shoobx";
-    repo = "xmldiff";
-    rev = version;
-    hash = "sha256-qn8gGultTSNKPUro6Ap4xJGcbpxV+lKgZFpKvyPdhtc=";
-  };
-in
-python3.pkgs.buildPythonApplication {
-  pname = "xmldiff";
-  inherit version src;
-  pyproject = true;
-
-  build-system = with python3.pkgs; [ setuptools ];
-
-  dependencies = with python3.pkgs; [
-    lxml
-    setuptools # pkg_resources is imported during runtime
-  ];
-
-  meta = {
-    homepage = "https://xmldiff.readthedocs.io/en/stable/";
-    description = "Library and command line utility for diffing xml";
-    longDescription = ''
-      xmldiff is a library and a command-line utility for making diffs out of
-      XML. This may seem like something that doesn't need a dedicated utility,
-      but change detection in hierarchical data is very different from change
-      detection in flat data. XML type formats are also not only used for
-      computer readable data, it is also often used as a format for hierarchical
-      data that can be rendered into human readable formats. A traditional diff
-      on such a format would tell you line by line the differences, but this
-      would not be readable by a human. xmldiff provides tools to make human
-      readable diffs in those situations.
-    '';
-    license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ anpryl ];
-  };
-}
+python3Packages.toPythonApplication python3Packages.xmldiff