Fix copying vendored files when they are symbolic links #183
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I'm working on a project where one vendored dependency uses symlinks for managing different SystemVerilog module versions. This was making bender's vendor commands to try to overwrite the symlink with the actual dereferenced file.
I assume this is not intended and the previous handling of symlinks was only for the special case where a vendored package has a symlink to another external directory. That's why I added another condition where the target of the symlink is an actual directory.