Function seedRng

lib/catch2/catch.hpp:13154–13159

    }

    void seedRng(IConfig const& config) {
        if (config.rngSeed() != 0) {
            std::srand(config.rngSeed());
            rng().seed(config.rngSeed());
        }
    }

    unsigned int rngSeed() {
        return getCurrentContext().getConfig()->rngSeed();