Fixed bug in optimizer where it didn't choose right table order in some cases


myisam/mi_delete.c:
  Remove not needed include errno.h
myisam/mi_delete_table.c:
  Remove not needed include errno.h
myisam/mi_extra.c:
  Remove not needed include errno.h
myisam/mi_locking.c:
  Remove not needed include errno.h
myisam/mi_log.c:
  Remove not needed include errno.h
myisam/mi_page.c:
  Remove not needed include errno.h
myisam/mi_rename.c:
  Remove not needed include errno.h
myisam/mi_update.c:
  Remove not needed include errno.h
myisam/mi_write.c:
  Remove not needed include errno.h
mysql-test/r/subselect.result:
  Update of test after optimzier fix
mysys/charset.c:
  Code cleanup
sql/item_cmpfunc.cc:
  Removed not needed comment
  Indentation cleanup
sql/item_cmpfunc.h:
  Indentation cleanup
sql/mysqld.cc:
  Updated comment for expire_logs_days
sql/set_var.cc:
  Remved duplicate code
sql/sql_select.cc:
  Fixed bug in optimizer where it didn't choose right table order in some cases (Bug found and fixed by Igor)