Adds the --arch flag to specify -DARDUINO_ARCH_<ARCH> during build
Adds the --arch flag to specify -DARDUINO_ARCH_<ARCH> during build

nxhack/Arturo,scottdarch/Arturo,jjbandit/Arturo,jjbandit/Arturo,nxhack/Arturo,scottdarch/Arturo