bug#58756: bug#58766: 29.0.50; Error in sqlite tests

[Stefan Kangas]

Mattias Engdegård <mattias.engdegard@gmail.com> writes:

> The recently added sqlite-returning test fails when the SQLite library
> does not implement RETURNING, added in 3.35.
>
> What about adding a Lisp function for retrieving the SQLite library
> version? It can be used to skip this particular test but would also be
> useful on its own.
>
> Proof-of-concept patch attached.

LGTM.