make: newlib: check if newlib nano folder was found
make: newlib: check if newlib nano folder was found

basilfx/RIOT,OTAkeys/RIOT,x3ro/RIOT,OTAkeys/RIOT,smlng/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,jasonatran/RIOT,lazytech-org/RIOT,mtausig/RIOT,OlegHahm/RIOT,aeneby/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,miri64/RIOT,RIOT-OS/RIOT,cladmi/RIOT,kYc0o/RIOT,yogo1212/RIOT,toonst/RIOT,authmillenon/RIOT,miri64/RIOT,ant9000/RIOT,lazytech-org/RIOT,toonst/RIOT,josephnoir/RIOT,mfrey/RIOT,RIOT-OS/RIOT,aeneby/RIOT,authmillenon/RIOT,cladmi/RIOT,smlng/RIOT,smlng/RIOT,ant9000/RIOT,kaspar030/RIOT,jasonatran/RIOT,x3ro/RIOT,authmillenon/RIOT,x3ro/RIOT,yogo1212/RIOT,basilfx/RIOT,A-Paul/RIOT,yogo1212/RIOT,mtausig/RIOT,authmillenon/RIOT,aeneby/RIOT,basilfx/RIOT,toonst/RIOT,cladmi/RIOT,OlegHahm/RIOT,aeneby/RIOT,rfuentess/RIOT,josephnoir/RIOT,smlng/RIOT,A-Paul/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,mtausig/RIOT,ant9000/RIOT,jasonatran/RIOT,miri64/RIOT,mtausig/RIOT,basilfx/RIOT,yogo1212/RIOT,ant9000/RIOT,jasonatran/RIOT,rfuentess/RIOT,kaspar030/RIOT,yogo1212/RIOT,OTAkeys/RIOT,mfrey/RIOT,lazytech-org/RIOT,lazytech-org/RIOT,miri64/RIOT,authmillenon/RIOT,mfrey/RIOT,A-Paul/RIOT,basilfx/RIOT,cladmi/RIOT,rfuentess/RIOT,kYc0o/RIOT,aeneby/RIOT,toonst/RIOT,josephnoir/RIOT,jasonatran/RIOT,cladmi/RIOT,mfrey/RIOT,kaspar030/RIOT,mfrey/RIOT,kaspar030/RIOT,OTAkeys/RIOT,kYc0o/RIOT,OTAkeys/RIOT,kYc0o/RIOT,smlng/RIOT,authmillenon/RIOT,mtausig/RIOT,ant9000/RIOT,lazytech-org/RIOT,RIOT-OS/RIOT,x3ro/RIOT,rfuentess/RIOT,A-Paul/RIOT,x3ro/RIOT,kaspar030/RIOT,miri64/RIOT,kYc0o/RIOT,rfuentess/RIOT,yogo1212/RIOT,toonst/RIOT,A-Paul/RIOT,josephnoir/RIOT