The main reason to do this is so that we can compile laser_geometry
with the clang static analyzer. As of clang++-14 (what is in
Ubuntu 22.04), the default still seems to be C++14, so we need
to specify C++17 so that new things in the rclcpp headers work
properly.
Further, due to reasons I don't fully understand, I needed to
set CMAKE_CXX_STANDARD_REQUIRED in order for clang to really use
that version. So set this as well.
Signed-off-by: Chris Lalancette <clalancette@openrobotics.org>
e95ea15102