Remove third-party
Created by: wangkuiyi
https://github.com/PaddlePaddle/paddle-mobile/tree/develop/third-party depends on the solving of this issue, otherwise, cpplint will check third-party source code.
Created by: wangkuiyi
https://github.com/PaddlePaddle/paddle-mobile/tree/develop/third-party depends on the solving of this issue, otherwise, cpplint will check third-party source code.