Instead of manipulating CR explicitly to cope with CRLF (Windows) line
endings in input and produce output with CRLF line endings, just
convert files from/to CRLF line endings when reading/writing.
The minimum required Perl version remains 5.8, since this both the
version that introduced Digest::MD5 (which was used before this patch)
and the version that introduced open "<:crlf" (which this patch
introduces).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>