No needs to load charset index if the character set is build-in.


client/mysql.cc:
  No needs to load charset index if the character set is build-in.
client/mysqlcheck.c:
  No needs to load charset index if the character set is build-in.
client/mysqldump.c:
  No needs to load charset index if the character set is build-in.
client/mysqlimport.c:
  No needs to load charset index if the character set is build-in.