[issue3022] mailbox module, two small fixes

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

@gpolo: your patch is correct, but I prefer line.rstrip() to 
line.strip(). My new patch combines your two patches + replace strip 
by rstrip + use itervalues() instead of items() in MH.pack().

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nosy: +haypo
Added file: http://bugs.python.org/file11918/mailbox.patch

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<http://bugs.python.org/issue3022>
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