adding CP866 xlocale

[Stanislav Maslovski <stanislav.maslovski@gmail.com>]

Hello debian-x!

I have ported a patch from ALT-Linux (a russian linux distro) that adds
support of CP866 locale to xlibs. I have also patched luit so that it
supports translating from/to this encoding. So far everything works nicely.

If this change can be of interest to debian in general I am happy to provide
the necessary patches. Personally, I think this addition will be appreciated
by the users from the post-USSR countries, especially by the participants
of FIDONET. Native support of CP866 locale simplifies the use and porting of
some old good software like golded, etc.

-- 
Stanislav