[sqlite] DELETE can fail with reverse_unordered_selects = true

[Bradley Grainger]

In some circumstances "DELETE FROM x WHERE col = val" may fail to delete all 
rows?if?"PRAGMA reverse_unordered_selects = true;" has been executed.

Steps to repro:
Open the test DB (https://downloads.logoscdn.com/temp/test.db 40KB)?with SQLite 
3.12.1
Run:
  pragma reverse_unordered_selects = true;
  delete   from ids where fk = 'DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD';
  select * from ids where fk = 'DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD';

Expected Behaviour: No rows returned.

Actual Behaviour:?SQLite returns the row: 79|DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

Example:
C:\>sqlite3 test.db
SQLite version 3.12.1 2016-04-08 15:09:49
Enter ".help" for usage hints.
sqlite> pragma reverse_unordered_selects = true;
sqlite> delete from ids where fk = 'DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD';
sqlite> select * from ids where fk = 'DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD';
79|DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
SQLite>

I have reproed this with SQLite 3.12.1 on Windows 10 x64 and Mac OS X 10.10.

I wasn't able to repro (using this file) with SQLite 3.8.11.1, but I could with 
SQLite 3.9.0 (on Mac OS X 10.10).