shared library suffix returns `d.so` rather than just `.so` when using debug

[wjwwood]

This is a behavior inherited from poco:

http://pocoproject.org/docs/Poco.SharedLibrary.html#16662

This commonly doesn't work for us, so I will probably open a pull request to change the behavior of the shared library suffix function in class_loader to make that optional or remove it entirely.

[mikaelarguedas]

Looking a bit into this it seems that we need to build poco with the definition POCO_NO_SHARED_LIBRARY_DEBUG_SUFFIX https://github.com/pocoproject/poco/blob/558c7ff45fe32ffed02736b9732b4a9d8044aa53/Foundation/include/Poco/Config.h#L177

They don't expose that definition through CMake AFAICT so right now I'm tempted to extend the existing windows hack to the other platforms. https://github.com/ros/class_loader/blob/adcb526f86a627009fdb94ae04d45fafde3765e3/src/class_loader.cpp#L59-L65

The other option would be to host a modified version of Poco in the ros2 org and to compile it with that definition.

[dirk-thomas]

Maybe we should consider to support that use case rather than providing custom built packages to avoid the debug suffix?