newelle: ship on moby, hack in cross compilation

overlays/cross.nix

@@ -588,6 +588,25 @@ in with final; {
     cargo = crossCargo;
   };
 
+  # pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
+  #   (pyself: pysuper: {
+  #     # 2025/07/23: upstreaming is unblocked, but solution is untested.
+  #     # the references here are a result of the cython build process.
+  #     # cython is using the #include files from the build python, and leaving those paths in code comments.
+  #     # better solution is to get cython to use the HOST python??
+  #     #
+  #     # python3Packages.srsly is required by `newelle` program.
+  #     srsly = pysuper.srsly.overridePythonAttrs (upstream: {
+  #       nativeBuildInputs = (upstream.nativeBuildInputs or []) ++ [
+  #         removeReferencesTo
+  #       ];
+  #       postFixup = (upstream.postFixup or "") + ''
+  #         remove-references-to -t ${pyself.python.pythonOnBuildForHost} $out/${pyself.python.sitePackages}/srsly/msgpack/*.cpp
+  #       '';
+  #     });
+  #   })
+  # ];
+
   # qt6 = prev.qt6.overrideScope (self: super: {
   #   # qtbase = super.qtbase.overrideAttrs (upstream: {
   #   #   # cmakeFlags = upstream.cmakeFlags ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [