Update internal CMake files to match with cmake_minimum_requred(VERSION 3.18.4)
This was the latest version used all the project's cmake_minimum_required definitions.
Building the Dyninst component fails after setting cmake_minimum_requred to 3.21. Taking it back to 3.18.4. I just want to get everything synchronized in this PR, we can investigate that failure afterwards.
Update internal CMake files to match with
cmake_minimum_requred(VERSION 3.18.4)
This was the latest version used all the project'scmake_minimum_required
definitions.