use python's sqlite3 if pysqlite > 2.6
use python's sqlite3 if pysqlite > 2.6

users have reported errors about vacuuming in a transaction, which
appear to be due to changed handling of DDL statements

socialpercon/anki-1,florianjacob/anki,subfusc/anki,kenjhim/anki,xuewenfei/anki,jkitching/anki,go38/anki,Arthaey/anki,Stvad/anki