message: vertexcodec: Fix MSVC warning
diff: @@ -351,7 +351,7 @@ static bool decodeBytesGroupBuildTables()
  {
  int maski = (mask >> i) & 1;
  shuffle[i] = maski ? count : 0x80;
  - count += maski;
  + count += char(maski);
  }
  memcpy(kDecodeBytesGroupShuffle[mask], shuffle, 8);
  