(Vcharset_ucs): Deleted because it is not used.

(Vcharset_ucs): Deleted because it is not used.
(Vcharset_ucs_bmp): Likewise.
(Vcharset_mojikyo): Add new extern variable definition.
(Vcharset_latin_iso8859_2): Deleted because it is not used.
(Vcharset_latin_iso8859_3): Likewise.
(Vcharset_latin_iso8859_4): Likewise.
(Vcharset_latin_iso8859_9): Likewise.
(Vcharset_latin_viscii_lower): Likewise.
(Vcharset_latin_viscii_upper): Likewise.
(DECODE_CHAR): If charset is `mojikyo-pj-N', corresponding `mojikyo'
code-point is used to decode.
(encode_char_2): New function [to convert `mojikyo' code-point to
Mojikyo font encoding].
(ENCODE_CHAR): Use `encode_char_2' instead of `encode_code_1'.
(breakup_char_1): Likewise.
(CHAR_CHARSET): Use `ENCODE_CHAR' instead of `BREAKUP_CHAR'.