* Copied PR6744
* Added CMakeLists.txt into gflags
* Return gflags into .gitmodules
* Added CMakeLists.txt into gtest
* fix: remove extra gflags and gtests from .gitmodules
* Change syntax in set gtest_targets
* Make gtest/CMakeLists.txt as in PR6744 for pre-commit experiment
* Update gtest/CMakeLists.txt
* Change version of gtest repo
* Return gtest info into .gitmodules
* Update gflags version to currently used