some default_charset_info were removed


sql/sql_base.cc:
  some default_charset_info were removed
sql/table.cc:
  some default_charset_info were removed
sql/unireg.cc:
  some default_charset_info were removed
sql/item_cmpfunc.cc:
  some default_charset_info were removed
sql/item_func.cc:
  some default_charset_info were removed