Created by: DannyIsFunny

[Issue] Python installer(.whl) compiled by current develop branch can be installed, but we can not import paddlelite after installing. [Reasons] This problem is caused by #3630 . In #3630, we stripped C++ dynamic library and python dynamic library to remove third_party symbols. But some symbols about python installer may be stripped , since we are not sure which symbols are related to python installer , we disabled python library stripping in this pull request. [Effect of Current Pull Request] This bug is fixed. After merging this PR , python installer compiled by current develop branch can work properly.