[issue5214] Add KOI8-RU as a known encoding

[STINNER Victor]

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

My version of iconv (2.6.1) doesn't support KOI8-RU, only:
 - CSKOI8R
 - KOI-7
 - KOI-8
 - KOI8-R: supported by python trunk
 - KOI8-T
 - KOI8-U: supported by python trunk
 - KOI8
 - KOI8R
 - KOI8U

Note: python trunk doesn't support KOI8R nor KOI8U (which are just 
aliases to KOI8-R and KOI8-U).

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<http://bugs.python.org/issue5214>
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