message: gltfpack: Separate file names with --
  This fixes processing of files that have names that start with -
diff: @@ -236,7 +236,7 @@ bool encodeKtx(const std::string& data, const char* mime_type, std::string& resu
  else
  cmd += " --linear";
  - cmd += " ";
  + cmd += " -- ";
  cmd += temp_output.path;
  cmd += " ";
  cmd += temp_input.path;
  