Comment out unused command from release script.

kokoro/release/protoc/linux/build.sh

@@ -30,7 +30,7 @@ docker run -v $(pwd):/var/local/protobuf --rm $DOCKER_IMAGE_NAME \
 }
 
 # Cross-build for some architectures.
-sudo apt install g++-aarch64-linux-gnu
 # TODO(xiaofeng): It currently fails with "machine `aarch64' not recognized"
 # error.
+# sudo apt install -y g++-aarch64-linux-gnu
 # protoc-artifacts/build-protoc.sh linux aarch_64 protoc