Add fallback path if GOBY_ROOT is not setted.
Add fallback path if GOBY_ROOT is not setted.

st0012/Rooby,Maxwell-Alexius/goby,goby-lang/goby,goby-lang/goby,Maxwell-Alexius/goby,goby-lang/goby,st0012/Rooby,Maxwell-Alexius/goby,hachi8833/goby,hachi8833/goby,hachi8833/goby