[issue1923] meaningful whitespace can be lost in rfc822_escape

[Stephen Emslie]

Stephen Emslie added the comment:

Here's that keeps the whitespace in tact, along with a simple test. This
doesn't patch docs as the existing documentation_ already describes the
long string as multiple lines of "plain text in reStructuredText
format", which is what this fixes.

.. _documentation:
http://docs.python.org/dev/distutils/setupscript.html#additional-meta-data

Added file: http://bugs.python.org/file9310/distutils_metadata_whitespace.diff

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