[ros2] library suffix hack

[mikaelarguedas]

workaround for #31

See #31 for original issue description and a potential real fix description.
This is needed for #59 tests to pass in Debug mode

[wjwwood]

Sometimes it is correct, but this lgtm. pluginlib does some tricks to handle this too.

[mikaelarguedas]

Sometimes it is correct

Yeah it seems correct for many external projects. Out of curiosity, do you know why we don't produce libraries with the trailing d in ROS 2 ? (I mean is it a design decision we made ?)

[wjwwood]

I guess because cmake doesn't do it for you. It's purely a convention that we just didn't opt into. Also it's not required most of the time on Linux and macOS. It's most problematic on Windows which often builds into separate folders anyways. For distribution on Windows specifically it might be useful when you want to side-by-side install the release and debug versions.

[mikaelarguedas]

Thanks @wjwwood for the feedback. Given that we almost always ship a single version of the lib (relwithdebinfo) it makes sense not to bother adding the suffix complexity to facilitate side by side install.

I'll merge this and leverage it in #59 then

[mikaelarguedas]

Comment from @dirk-thomas :
"Wouldn't it be nice if the debug shared libraries could be loaded for debugging?"

To keep in mind when thinking about addressing #31, it would be great to give users control about what libraries to find and load rather than making the decision for them one way or another