rc-file: use elem.Interface() to get value
rc-file: use elem.Interface() to get value

Use elem.Interface() to get the value instead of
implicitly relying on fmt.*Printf("%v", elem)
due to a discrepenacy between Go1.5  and < Go1.5
ie https://github.com/golang/go/issues/12954

cacack/drive,tom-saunders/drive,tom-saunders/drive,sselph/drive,odeke-em/drive,Dedsec01/drive,odeke-em/drive,sselph/drive,Dedsec01/drive,gccpacman/drive,gdm85/drive,gccpacman/drive,cacack/drive,gdm85/drive