Add SYSTEM to target_include_directories in vendored CMake wrappers and
set INTERFACE_SYSTEM_INCLUDE_DIRECTORIES on imported / sub-project
targets so warnings from third-party headers no longer surface in our
build output. Introduces a mark_target_includes_system() helper in
cmake/utils.cmake (resolves aliases, skips missing targets) used by the
upstream-add_subdirectory wrappers (glog, gflags, googletest, yaml-cpp,
protobuf, antlr).
CMake 3.31+ has removed support for the OLD behavior of policies
CMP0042, CMP0045, CMP0054, and CMP0059. This causes a hard
configuration error when building from source with newer CMake versions.
Changing these to NEW resolves the build failure. The NEW behavior has
been the default since CMake 3.0/3.3 and does not affect functionality.
Fixes#144
egolearner
Jalin Wang
Aashish Thapa
feihongxu0824
sanyi