[Groff] Building groff.pdf

[Axel Kielhorn]

I've just updated to the current (10:00 CET today) version of groff  
and had a problem building groff.pdf with the texinfo.tex file  
supplied by groff and an almost current (2008-12-26) Texlive 2008.

The texinfo in groff/doc is 2004-11-25.16, the version in Texlive 2008  
is 2008-11-09.14

With the groff version I get:

/usr/local/texlive/2008/texmf-dist/tex/texinfo/txi-en.tex:22:  
Undefined control
 sequence.
l.22 \txisetlanguage
                    {USenglish}{2}{3}

Renaming texinfo.tex solved the problem.

Axel