In D66791 I've introduced this [[ https://cmake.org/cmake/help/latest/module/CMakeDependentOption.html | CMakeDependentOption ]] but in
D71306 @JDevlieghere has changed the way optional dependencies
are handled in LLDB. Today there's no occurence of
cmake_dependent_option inside the lldb source tree.
That's why this include can be removed.