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openttd: remove dependency on nlohmann_json
This was vendored from https://github.com/OpenTTD/OpenTTD/commit/ba67f39db6efa2c251999a94668cd0e10eb8f6ad onwards.
This was vendored from https://github.com/OpenTTD/OpenTTD/commit/ba67f39db6efa2c251999a94668cd0e10eb8f6ad onwards.