[issue19668] Add support of the cp1125 encoding

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Please also add the aliases you mentioned.

I have already added these aliases.

I should remove added in last moment the 'cp866nav' alias from Lib/encodings/aliases.py because it is actually a little different encoding (it have two Byelorussian letters "Ўў" instead cp866 characters "·√" at positions 0xfa-0xfb).

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