walk: treat symbolic links to directories as directories #1397
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Due to how walkdir works if symlinks are not followed, symlinks to
directories are seen as simple files by ripgrep. This caused a panic
in some cases due to receiving a WalkEvent::Exit event without a
corresponding WalkEvent::Dir event.
This is fixed by looking at the metadata of the file in the case of a
symlink to determine if it's a directory.
Fixes #1389