On Windows, the mode bits reported by [Lstat] and [Stat] for
reparse points changed. Mount points no longer have [ModeSymlink] set,
and reparse points that are not symlinks, Unix sockets, or dedup files
now always have [ModeIrregular] set.
This behavior is controlled by the winsymlink setting.
For Go 1.23, it defaults to winsymlink=1.
Previous versions default to winsymlink=0.