base64 bug handling \r characters

Tried to send out a PDF, and it got horribly mangled by the
base64 encoding.

The original file:

%  od -cx CIS/CIS-AIX-draft-09232004.pdf | head -6
0000000   %   P   D   F   -   1   .   4  \r  \n   %   ä   ö   Ü   ß  \r
        5025 4644 312d 342e 0a0d e425 dcf6 0ddf
0000020  \n   1       0       o   b   j  \r  \n   <   <       /   L   e
        310a 3020 6f20 6a62 0a0d 3c3c 2f20 654c
0000040   n   g   t   h       2       0       R  \r  \n               /
        676e 6874 3220 3020 5220 0a0d 2020 2f20

What results from decoding the resulting base64:

% od -cx CIS-AIX-draft-09232004.pdf | head -6
0000000   %   P   D   F   -   1   .   4  \n   %   ä   ö   Ü   ß  \n   1
        5025 4644 312d 342e 250a f6e4 dfdc 310a
0000020       0       o   b   j  \n   <   <       /   L   e   n   g   t
        3020 6f20 6a62 3c0a 203c 4c2f 6e65 7467
0000040   h       2       0       R  \n               /   F   i   l   t
        2068 2032 2030 0a52 2020 2f20 6946 746c

My gut instinct is to say it's some odd quoting issue in
Base64_EncodeBlock - my brain hurts trying to follow what
happens to $c and $old and $x if we're looking at whitespace.

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