Add C++98 version for 9.3-backports
This now makes starter C++98 code again. It also reverts the path adaptation for cppTango 9.4.0 and adapts the CI to not compile against main anymore.
This now makes starter C++98 code again. It also reverts the path adaptation for cppTango 9.4.0 and adapts the CI to not compile against main anymore.