Fix ghc directory iterator treating all files subsequent to a symlink as symlink

[Qrox]

Summary

Bugfixes "Fix files after a symlink in a directory all treated as symlink on Windows"

Purpose of change

The game does not handle directory with symlinks in it correctly on Windows, so if a player has a symlink in their gfx directory that points to another tileset repo, none of the tilesets after that tileset will be listed in the options.

Describe the solution

Check a file is actually a reparse point before checking its reparse tag to avoid getting an undefined value. Also removed a hack that uses structure size to deteremine structure type.

Describe alternatives you've considered

Testing

All tilesets are now listed, and the game did not explode when loading a save.

Additional context

I plan to PR this patch upstream too, but for now we can include in our repo first.