(default-coded-charset-priority-list): Add `==jis-x0213-2',

(default-coded-charset-priority-list): Add `==jis-x0213-2',
`==ruimoku-v6', `==cbeta', `==jef-china3', `===mj-0', `===mj-1',
`===jis-x0208@1990', `===jis-x0213-1', `===jis-x0213-2',
`===big5-cdp', `===ucs-bmp-cjk@gb', `===adobe-japan1-6',
`===cns11643-1', `===cns11643-2', `===cns11643-3', `===cns11643-4',
`===cns11643-5', `===cns11643-6', `===cns11643-7',
`===hanyo-denshi/ft', `===hanyo-denshi/ib', `===hanyo-denshi/jt',
`===jis-x0208@1983', `===jis-x0208@1978', `===jis-x0212',
`===ks-x1001', `===daikanwa', `===ucs-sip-ext-b@iso', `===cbeta' and
`===jef-china3'.