onnxruntime

882c301b - Fix onnxruntime build on s390x with more recent GCC versions (#26374)

Fix onnxruntime build on s390x with more recent GCC versions (#26374) ### Description Port upstream fix for protobuf for s390x. Fix unused variable warnings. ### Motivation and Context These changes fix unnoticed issues which might appear when onnxruntime is compiled on s390x with newer gcc versions.