DirIO module ReadOptions do not work for Windows

Need to remove the ifdef:

```
#if defined(mingw32_HOST_OS) || defined(__MINGW32__)
    -- | Only the default ReadOptions are supported for Windows. Please use "id"
    -- as the configuration modifier.
      ReadOptions
#else
      ReadOptions
    , followSymlinks
    , ignoreMissing
    , ignoreSymlinkLoops
    , ignoreInaccessible
#endif
```