[PATCH] tests: add 'large-time' as a testable feature

[PATCH] tests: add 'large-time' as a testable feature

This allows test cases to require this feature to run and to be used in
%if conditions.

Large here means larger than 32 bits. Ie does not suffer from y2038.

Closes #11696

Backported by: Aquila Macedo Costa <aquilamacedo@riseup.net>.

Changes:
- Refresh patch context

Gbp-Pq: Name large-time-testable-feature.patch