Kevin Daudt c2868dae68 testing/horizon: fix ftbfs
Due to `-Werror`, this fails to build on gcc >= 10.0.1. This has been
[reported][0] to json upstream, and fixed in this [pr][1].

Backport the fix to horizon

[0]:https://github.com/nlohmann/json/issues/1939
[1]:https://github.com/nlohmann/json/pull/2144
2021-01-18 11:29:49 +00:00
..
2021-01-18 11:29:49 +00:00