message: fix build on Visual Studio 2013 and earlier
diff: @@ -72,7 +72,7 @@ Mat blobFromNPY(const std::string& path)
  ifs.ignore(1); // Skip major version byte.
  ifs.ignore(1); // Skip minor version byte.
  - uint16_t headerSize;
  + unsigned short headerSize;
  ifs.read((char*)&headerSize, sizeof(headerSize));
  std::string header(headerSize, '*');
  