Simplify finding arduino dir
Simplify finding arduino dir

theicfire/Arduino-Makefile,bugobliterator/BUAGI,drpjk/Arduino-Makefile,sej7278/Arduino-Makefile,thomaskilian/Arduino-Makefile,WeAreLeka/Arduino-Makefile,jamesrob4/Arduino-Makefile,prpplague/Userspace-Arduino,joshsamuelson/Arduino-Makefile,harshavardhana/arduino-makefile,marioaugustorama/Arduino-Makefile,jamesrob4/Arduino-Makefile,drpjk/Arduino-Makefile,bugobliterator/BUAGI,marioaugustorama/Arduino-Makefile,prpplague/Userspace-Arduino,theicfire/Arduino-Makefile,WeAreLeka/Arduino-Makefile,AlexSatrapa/Arduino-Makefile,AlexSatrapa/Arduino-Makefile,prpplague/Userspace-Arduino,joshsamuelson/Arduino-Makefile,kindsenior/Arduino-Makefile,prpplague/Userspace-Arduino,exmachina-dev/Arduino-Makefile,thomaskilian/Arduino-Makefile,bugobliterator/BUAGI,kindsenior/Arduino-Makefile,sej7278/Arduino-Makefile,WeAreLeka/Arduino-Makefile,bugobliterator/BUAGI,tuna-f1sh/Arduino-Makefile,sudar/Arduino-Makefile,harshavardhana/arduino-makefile,bugobliterator/BUAGI,drpjk/Arduino-Makefile,exmachina-dev/Arduino-Makefile,tuna-f1sh/Arduino-Makefile,bugobliterator/BUAGI,sudar/Arduino-Makefile