Unify Docker and Travis build.sh for Android
Created by: wangkuiyi
We have two build scripts for Android:
-
the one we use in Dockerfile.android: https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/scripts/docker/build_android.sh, and
-
the one we use with Travis-CI: https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/scripts/travis/build_android.sh
To keep the simplicity and consistency of the codebase, could we merge them into one?