message: gltfpack: Fix .gltf buffer URI output
  Before this change the URI had a redundant slash.
diff: @@ -2156,7 +2156,7 @@ int main(int argc, char** argv)
  std::string binname = binpath;
  std::string::size_type slash = binname.find_last_of("/\\");
  if (slash != std::string::npos)
  - binname.erase(0, slash);
  + binname.erase(0, slash + 1);
  FILE* outjson = fopen(output, "wb");
  FILE* outbin = fopen(binpath.c_str(), "wb");
  