patch 8.0.0982: cannot use a terminal when 'encoding' is non-utf8 multi-byte

patch 8.0.0982: cannot use a terminal when 'encoding' is non-utf8 multi-byte

Problem:    When 'encoding' is set to a multi-byte encoding other than utf-8
            the characters from ther terminal are messed up.
Solution:   Convert displayed text from utf-8 to 'encoding' for MS-Windows.
            (Yasuhiro Matsumoto, close #2000)