message: add typedef lost during rebase
diff: #include <univalue.h>
  +
  +// below two require C++11
  +#include <functional>
  +#include <random>
  +
  +#ifdef DEBUG_LOCKORDER
  +LockData lockdata;
  +#endif
  +
  +// Lambda used to generate entropy, per-thread (see CpuMiner, et al below)
  +typedef std::function<uint32_t(void)> RandFunc;
  +
  using namespace std;
  // Internal miner
  