Fix protoc error when cross compiling on a linux aarch64 host (#28567)
### Description
Without this change, `./build.sh --config MinSizeRel --build_wasm
--skip_tests --target onnxruntime_webassembly
--compile_no_warning_as_error --parallel` fails on Asahi Linux:
```
-- Fetch protoc_binary from https://github.com/protocolbuffers/protobuf/releases/download/v21.12/protoc-21.12-linux-x86_32.zip
<snip>
/bin/sh: line 1: ../protoc_binary-src/bin/protoc: cannot execute binary file: Exec format error
```
The command succeeds with this change.