[staging] python3.pkgs.sphinx-issues: avoid use of pandoc in build closure (riscv64-fix) (#393093)

pkgs/development/python-modules/sphinx-issues/default.nix

···
   buildPythonPackage,
   sphinx,
   fetchFromGitHub,
-  pandoc,
 }:
-
 buildPythonPackage rec {
   pname = "sphinx-issues";
   version = "3.0.1";
   format = "setuptools";
-  outputs = [
-    "out"
-    "doc"
-  ];
 
   src = fetchFromGitHub {
     owner = "sloria";
···
   pythonImportsCheck = [ "sphinx_issues" ];
 
   propagatedBuildInputs = [ sphinx ];
-
-  nativeBuildInputs = [ pandoc ];
-
-  postBuild = ''
-    pandoc -f rst -t html --standalone < README.rst > README.html
-  '';
-
-  postInstall = ''
-    mkdir -p $doc/share/doc/$name/html
-    cp README.html $doc/share/doc/$name/html
-  '';
 
   meta = with lib; {
     homepage = "https://github.com/sloria/sphinx-issues";