[issue5214] Add KOI8-RU as a known encoding

[Dwayne Bailey]

Dwayne Bailey <dwayne+pythonbugs at translate.org.za> added the comment:

@haypo: The encoding works and doesn't throw and error, my guess is that
aliases should be updated to cover the variant namings of -R and -U.

I also found glibc points to this reference
http://cad.ntu-kpi.kiev.ua/multiling/koi8-ru/ which seems to have
disappeared.  I couldn't find a way to validate that the glibc code
points where the same as the ones you have.

My iconv --version is 2.9

Apart from that I can't vouch for its correctness

@lemburg: I can't comment on the status of the standard.  I would assume
that like most 8 bit encodings that these are falling away and being
replaced by Unicode.

Why I'm interested in these issues is that our Python tools are used to
recover translations from installed .mo files on Linux.  I look for
encoding issues on a semi-regularly basis and fix any ones that present
issues. This is the first I've found that is missing in Python.

For us its useful in that we present a path for people to move from an
old encoding into Unicode if needed.

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