[Release] update build_from_source script to fix compile problems.

Author: cxfeng1

scripts/build_from_source.sh

@@ -32,13 +32,14 @@ npm run build:rax
 echo "Weex JS Framework build completed."
 sleep 2
 
+mkdir pre-build
 cp dist/weex-js-framework.min.js pre-build/native-bundle-main.js
-cp dist/weex-js-framework.min.js android/sdk/assets/native-bundle-main.js
+cp dist/weex-js-framework.min.js android_sdk/assets/native-bundle-main.js
 cp dist/weex-js-framework.min.js pre-build/weex-main-jsfm.js
-cp dist/weex-js-framework.min.js android/sdk/assets/weex-main-jsfm.js
+cp dist/weex-js-framework.min.js android_sdk/assets/weex-main-jsfm.js
 cp dist/weex-polyfill.min.js pre-build/weex-polyfill.js
 cp dist/weex-rax.min.js pre-build/weex-rax-api.js
-cp dist/weex-rax.min.js android/sdk/assets/weex-rax-api.js
+cp dist/weex-rax.min.js android_sdk/assets/weex-rax-api.js
 
 gradle wrapper --gradle-version 3.3
 echo 'include ":android_sdk"'>settings.gradle