Keeping the default behaviour of SQLite being built statically,
so as not to break anyone's workflow, but allowing for downstream
packagers to link dynamically against SQLite (where it's fine because
that's the point of package managers).
Note that SQLite is still *not* enabled by default, thanks to the `?` operator.
Co-authored-by: Daniel García <dani-garcia@users.noreply.github.com>