protobuf github仓库地址https://github.com/protocolbuffers/protobuf/releases。
没有提供armv7l 32位的版本，下载cpp的tar包，编译安装。
下载c++的tar包，protobuf-cpp-x.xx.x.tar.gz
wget https://github.com/protocolbuffers/protobuf/releases/download/v3.17.2/protobuf-cpp-3.17.2.tar.gz
tar -zxf protobuf-cpp-3.17.2.tar.gz
cd protobuf-3.17.2/
./configure --prefix=/usr/local/protoc
sudo make && sudo make install
/usr/local/protoc/bin/protoc
/usr/local/protoc/bin/protoc --version