python3Packages.keystone-engine: migrate to pyproject, enable __structuredAttrs, use finalAttrs (#529264)

pkgs/development/python-modules/keystone-engine/default.nix

@@ -3,19 +3,26 @@
   stdenv,
   buildPythonPackage,
   fetchPypi,
+  setuptools,
   keystone,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "keystone-engine";
   version = "0.9.2";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchPypi {
-    inherit pname version;
+    inherit (finalAttrs) pname version;
     sha256 = "1xahdr6bh3dw5swrc2r8kqa8ljhqlb7k2kxv5mrw5rhcmcnzcyig";
   };
 
+  build-system = [
+    setuptools
+  ];
+
   setupPyBuildFlags = lib.optionals stdenv.hostPlatform.isLinux [
     "--plat-name"
     "linux"
@@ -37,4 +44,4 @@ buildPythonPackage rec {
     maintainers = with lib.maintainers; [ dump_stack ];
     license = lib.licenses.gpl2Only;
   };
-}
+})