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Handle various patch file encodings v2

Patches are in all kinds of encodings, like cp1252, iso-8859-1, and utf-8.
Detecting them and reacting with decoding is really challenging and leads
to failures fairly regularly.

This patch aims to read in all patches as ASCII and use the surrogateescape
error handler to work around any peculiar characters. This recommendation
came from:

  http://python-notes.curiousefficiency.org/en/latest/python3/text_file_processing.html

It's been tested with all of the existing patches in the Linux stable queue
and it seems to work fine.

Signed-off-by: Major Hayden <major@redhat.com>

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