(Vcharset_hiragana_jisx0208): New variable.

(Vcharset_hiragana_jisx0208): New variable.
(Vcharset_katakana_jisx0208): New variable.
(Qhiragana_jisx0208): New variable.
(Qkatakana_jisx0208): New variable.
(make_charset): Add new argument `byte_offset'.
(charset_get_byte1): Modify for new coded-charset definition; use
`XCHARSET_UCS_MIN', `XCHARSET_UCS_MAX', `XCHARSET_CODE_OFFSET' and
`XCHARSET_BYTE_OFFSET'.
(Fmake_charset): Modify for `make_charset'.
(Fmake_reverse_direction_charset): Likewise.
(syms_of_mule_charset): Add new symbols `hiragana-jisx0208' and
`katakana-jisx0208'.
(complex_vars_of_mule_charset): Modify for `make_charset'; quote `.'
in font registry of charset `katakana-jisx0201', `latin-jisx0201',
`vietnamese-viscii-lower' and `vietnamese-viscii-upper'; modify
DOC-string of charset `japanese-jisx0208-1978' and
`japanese-jisx0208'; modify font registry of charset
`japanese-jisx0208' not to use font for JIS X0208:1990; add new
charset `hiragana-jisx0208' and `katakana-jisx0208'.