There's a merged pull request on the void-packages repository

openntpd: fix integer overflow on i686
https://github.com/void-linux/void-packages/pull/45993

Description:
<!-- Uncomment relevant sections and delete options which are not applicable -->

#### Testing the changes
- I tested the changes in this PR: **YES**

<!--
#### New package
- This new package conforms to the [package requirements](https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#package-requirements): **YES**|**NO**
-->

<!-- Note: If the build is likely to take more than 2 hours, please add ci skip tag as described in
https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#continuous-integration
and test at least one native build and, if supported, at least one cross build.
Ignore this section if this PR is not skipping CI.
-->
#### Local build testing
- I built this PR locally for my native architecture, (i686)

#### Change description
On i686, `time_t` is a 32 bit integer. In `openntpd`, an addition of two `time_t`s is performed, leading to an integer overflow. This code is part of the constraints logic of openntpd. When the bug triggers, all time sources will be marked invalid.

Upstream pull request: https://github.com/openntpd-portable/openntpd-portable/pull/74