databases/sqlite3: Patch for CVE-2018-8740

Detect databases whose schema is corrupted using
a CREATE TABLE AS statement and issue an appropriate error message.

CVE-2018-8740 will be entered into VuXML when SQLite will make
a release, because CVE-2018-8740 says that versions up to and including
the current version 3.22.0 are vulnerable.

Submitted by: Pavel Volkov <pavelivolkov@gmail.com> (maintainer)
Reported by: tj <tj@mrsk.me>