void silc_sftp_symlink(SilcSFTP sftp,
                           const char *linkpath,
                           const char *targetpath,
                           SilcSFTPStatusCallback callback,
                           void *context);

    Creates a new symbolic link indicated by the `linkpath' to the target
    indicated by the `targetpath'.  The `callback' is called to indicate
    the status of creation.