message: gltfpack: Fix clang warning on new macOS/Xcode
diff: #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
  #pragma GCC diagnostic ignored "-Wstrict-aliasing" // TODO: https://github.com/BinomialLLC/basis_universal/pull/275
  #pragma GCC diagnostic ignored "-Wstringop-overflow"
  +#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
  #endif
  #ifdef _MSC_VER
  