fts_is_charset_cjk(): Do not call strcmp()
fts_is_charset_cjk(): Do not call strcmp()

Remove a bogus reference to gb18030_chinese_ci, which was introduced
in MySQL 5.7. It is roughly equivalent to utf8mb4_unicode_ci, just
using a different internal encoding, and different collation.

natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2