stat methods do not work on windows

[plicease]

    # Failed test at t/archive_libarchive_entry.t line 78.
    # +------------+----+-------+
    # | GOT        | OP | CHECK |
    # +------------+----+-------+
    # | 1622158829 | eq | 1476  |
    # +------------+----+-------+
    # Failed test at t/archive_libarchive_entry.t line 81.
    # +-----+----+-------+
    # | GOT | OP | CHECK |
    # +-----+----+-------+
    # | 0   | eq | 1476  |
    # +-----+----+-------+

# Failed test 'stat'

[plicease]

The workaround for now is to throw a non-implemented exception when these methods are called.