.... which will allow periphs to instantiate this if they really feel like it, and for it to be removed on smaller boards on the custom build server (and potentially on lower-specced boards.
See discussion here:
https://github.com/ArduPilot/ardupilot/issues/7331
we were getting some uninitialised variables. While it only showed up in
AP_SbusOut, it means we can't be sure it won't happen on other objects,
so safest to remove the approach
Thanks to assistance from Lucas, Peter and Francisco