message: src/txmempool.cpp: make numEntries a uint32_t
  Don't ever serialize a size_t or long, their sizes are platform
  dependent.
  backports bitcoin@9f4fac98c429d9ee2135fab32dfae2d1fe171a45
diff: @@ -322,7 +322,7 @@ public:
  void Write(CAutoFile& fileout) const
  {
  fileout << nBestSeenHeight;
  - fileout << history.size();
  + fileout << (uint32_t)history.size();
  for (const CBlockAverage& entry : history) {
  entry.Write(fileout);
  }
  @@ -332,7 +332,7 @@ public:
  {
  int nFileBestSeenHeight;
  filein >> nFileBestSeenHeight;
  - size_t numEntries;
  + uint32_t numEntries;
  filein >> numEntries;
  if (numEntries <= 0 || numEntries > 10000)
  throw std::runtime_error("Corrupt estimates file. Must have between 1 and 10k entries.");
  