I hesitate to suggest this, since GNU tr has accepted \n for 15 years,
but there are supposedly a few crufty vendor-supplied versions of tr still
in use. Also, all of the other uses of tr-with-newline in git use \012.
Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>