pythonPackages.cython: don't test codestyle (#50432)

This requires pycodestyle when using python3 and adding it leads to test
failures for some reason. Maybe some patching we do. There is no reason to
test codestyle for a distro, so just disable it.

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

@@ -45,6 +45,7 @@ in buildPythonPackage rec {
   checkPhase = ''
     export HOME="$NIX_BUILD_TOP"
     ${python.interpreter} runtests.py -j$NIX_BUILD_CORES \
+      --no-code-style \
       ${stdenv.lib.optionalString (builtins.length excludedTests != 0)
         ''--exclude="(${builtins.concatStringsSep "|" excludedTests})"''}
   '';