Guileœôòùs Texinfo parser

Argh.  The idea of a full second Texinfo parser in GNU is fundamentally
wrong.  If you want to call it a "Guile docstring parser, whose language
happens to bear some resemblance to a subset of Texinfo", fine.

Anyway, your change to use more Guile in the Guile build procedures
makes sense to me.

k