* [Release2.4] Revert python link prs (#48573)

* Revert "Fix mac link python (#48017)"

This reverts commit 3fa7a736.

* Revert "[Cherry-pick] Fix python link error (#47811)"

This reverts commit ff642c68.

* Update config.go

* fix custom operator backward=None (#48656)

* [Custom Extension] Fix custom double_grad backward=None (#49224)

* fix custom double_grad backward=None

* fix custom_relu.cu bug && polish testcase of double_grad

* remove old dynamic graph test

* add import fluid

* add import fluid
Co-authored-by: NChen Weihang <chenweihang@baidu.com>