remove references to arduino leonardo platform
remove references to arduino leonardo platform

the Userspace.mk was originall based on the Arduino.mk which
included some references to the leonardo arduino platform. these
are not needed for Userspace.mk

prpplague/Userspace-Arduino,bugobliterator/BUAGI,bugobliterator/BUAGI,prpplague/Userspace-Arduino,bugobliterator/BUAGI,prpplague/Userspace-Arduino,prpplague/Userspace-Arduino,bugobliterator/BUAGI,bugobliterator/BUAGI,bugobliterator/BUAGI