Skip reparse points on Windows

```
import ctypes
def isLink(path):
    if os.path.exists(path):
        if os.path.isdir(path):
            FILE_ATTRIBUTE_REPARSE_POINT = 0x0400
            attributes = ctypes.windll.kernel32.GetFileAttributesW(unicode(path))
            return (attributes & FILE_ATTRIBUTE_REPARSE_POINT) > 0
    return False
```