When the function test_if_skip_sort_order prefers index backward scan 
to ref access the corresponding access functions must be set accordingly.


mysql-test/include/mix1.inc:
  Added a test case for bug #33697.
  Corrected one previous bad merge.
mysql-test/r/innodb_mysql.result:
  Added a test case for bug #33697.
mysql-test/t/disabled.def:
  Turned innodb_mysql test on.