Function seedRng

tests/catch.hpp:9703–9708

    }

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

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