(char-db-coded-charset-priority-list): Use

(char-db-coded-charset-priority-list): Use
`=jis-x0208@{1978|1983|1990}' instead of `japanese-jisx0208-1978',
`japanese-jisx0208' and `=jis-x0208-1990'.
(char-db-make-char-spec): Use coded-charset not found in
`char-db-coded-charset-priority-list' if a character can not be
represented by any coded-charset in
`char-db-coded-charset-priority-list' nor `=daikanwa'.