fix compilation on galactic #2
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This was probably last tested on humble. However on galactic it doesn't compile (mentioned as the required platform in the LSS-ROS2-Arms repo). This is just because the
readandwritefunctions of the system hardware interface have a breaking change starting with ROS iron.I added some
#if definedstatements for this. I decided against including older platforms than FOXY to catch this, because the lines would have become long, and I dare say that older platforms aren't supported anyway.With this fix, it compiles and works.