@cartouche too wide

[Stephen Gildea]

It appears that texinfo.tex 1999-09-25.10 assumes that a @cartouche
begins in vertical mode.  If you try it in horizontal mode, TeX
complains about an overfull hbox.

We discovered this when a user (unnecessarily) put @noindent immediately
before @cartouche.

My quick analysis says that all cartouches are too wide, but TeX only
complains when you try to stuff one into a paragraph.