python3Packages.transformers: don't import torch.distributed on darwin

This patch is in the same spirit as
d842a192cb where import for
torch.distributed was patched out for darwin. This other instance of the
incorrect import was spotted while packaging lm-eval through the latter
test suite.

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

@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  fetchpatch,
 
   # build-system
   setuptools,
@@ -68,6 +69,15 @@ buildPythonPackage rec {
     hash = "sha256-jh2bMmvTC0G0kLJl7xXpsvXvBmlbZEDA88AfosoE9sA=";
   };
 
+  patches = [
+    # Remove on the next major version bump
+    (fetchpatch {
+      url = "https://github.com/huggingface/transformers/commit/db864b5526d56fd99143619abff969bfcb5596d5.patch?full_index=1";
+      name = "dont-import-torch-distributed-if-not-available.patch";
+      hash = "sha256-XOraJmSt9Rp/oNiil6vDUBqZhd8MDbA0nz1Tx16Mk14=";
+    })
+  ];
+
   build-system = [ setuptools ];
 
   dependencies = [