Enable latin1 by default


configure.in:
  Always compile latin1
sql/ha_myisam.cc:
  Fix for "SHOW KEYS FROM table" and various key types
sql/sql_show.cc:
  Fix to use Monty's changes in frm format
sql/sql_table.cc:
  Fix to use Monty's changes in frm format
sql/structs.h:
  Fix to use Monty's changes in frm format
sql/table.cc:
  Fix to use Monty's changes in frm format