message: fix windows symlink creation
diff: @@ -292,7 +292,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  if src.is_dir() {
  fs::symlink_dir(src, dst)
  } else {
  - fs::symlink(src, dst)
  + fs::symlink_file(src, dst)
  }
  }
  