When followlinks is true, symlinks is not needed.

But I this commit breaks a code like following:

def unsymlink(top):
    for root, dirs, files in os.walk(top):
        for name in dirs:
            path = os.path.join(root, name)
            if os.path.islink(path):
                target = os.path.join(root, os.readlink(path))
                os.unlink(path)
                shutil.copytree(target, path)
        for name in files:
            path = os.path.join(root, name)
            if os.path.islink(path):
                target = os.path.join(root, os.readlink(path))
                os.unlink(path)
                shutil.copy2(target, path)