python3Packages.reflink: fix cross-compilation

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

@@ -3,7 +3,6 @@
 , fetchPypi
 , lib
 , pytestCheckHook
-, pytest-runner
 }:
 
 buildPythonPackage rec {
@@ -15,10 +14,17 @@ buildPythonPackage rec {
     sha256 = "sha256-ySU1gtskQTv9cDq/wbKkneePMbSQcjnyhumhkpoebjo=";
   };
 
-  propagatedBuildInputs = [ cffi pytest-runner ];
+  propagatedBuildInputs = [ cffi ];
+
+  propagatedNativeBuildInputs = [ cffi ];
 
   checkInputs = [ pytestCheckHook ];
 
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "pytest-runner" ""
+  '';
+
   # FIXME: These do not work, and I have been unable to figure out why.
   doCheck = false;