message: Fix test on Windows hosts
  FlushFileBuffers requires that a file be opened for writing
diff: @@ -188,7 +188,7 @@ fn test_file_sync() {
  let path = prepare_with_content("miri_test_fs_sync.txt", bytes);
  // Test that we can call sync_data and sync_all (can't readily test effects of this operation)
  - let file = File::open(&path).unwrap();
  + let file = OpenOptions::new().write(true).open(&path).unwrap();
  file.sync_data().unwrap();
  file.sync_all().unwrap();
  