python3Packages.docutils: use the locale specification from buildPythonPackage

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

@@ -1,5 +1,4 @@
 {
-  stdenv,
   lib,
   fetchFromRepoOrCz,
   buildPythonPackage,
@@ -34,13 +33,9 @@ let
 
     nativeCheckInputs = [ pillow ];
 
-    # Only Darwin needs LANG, but we could set it in general.
-    # It's done here conditionally to prevent mass-rebuilds.
-    checkPhase =
-      lib.optionalString stdenv.hostPlatform.isDarwin ''LANG="en_US.UTF-8" LC_ALL="en_US.UTF-8" ''
-      + ''
-        ${python.interpreter} test/alltests.py
-      '';
+    checkPhase = ''
+      ${python.interpreter} test/alltests.py
+    '';
 
     # Create symlinks lacking a ".py" suffix, many programs depend on these names
     postFixup = ''