message: freelist: use MWC
diff: #include <random>
  #include <utility>
  -#include "rng/xoroshiro128plus.h"
  +// #include "rng/xoroshiro128plus.h"
  +#include "rng/mwc.h"
  #include "internal.h"
  @@ -181,7 +182,7 @@ private:
  uintptr_t _start{0};
  uintptr_t _end{0};
  MiniHeap *_attachedMiniheap{nullptr};
  - Xoroshiro _prng;
  + MWC _prng;
  uint16_t _maxCount{0};
  uint16_t _off{0};
  volatile uint8_t _lastOff{0};
  