Make LHAInputStream detect -lzs- algorithm.
Make LHAInputStream detect -lzs- algorithm.

The input stream code skips forward at the start of input until it
reaches an LHA header, so that self-extracting archives are correctly
handled. However, it was not detecting -lzs-, support for which was
only recently added.

fragglet/lhasa,fragglet/lhasa,fragglet/lhasa