[issue38945] Remove newline characters from uu encoding methods

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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versions: +Python 2.7, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38945>
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