- Post-merge cleanup.
- Disabled this bug's test for 5.x until 16861 is resolved.


mysql-test/r/distinct.result:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Remove results for this bug.  When bug number 16861 is resolved, the result
  should match the 4.1 result.
mysql-test/t/distinct.test:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Disable the test for 20836.  This test should remain disabled until bug 16861
  is fixed.  The results for the test should be the same as in 4.1.
sql/sql_class.cc:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Post-merge cleanup.