Updated the documentation building tools to work with a recent linuxdoc-tools package.
Note that this is (and always was) a terrible hack and we really shouldreplace it with something reasonable which wouldn't need changing everytime linuxdoc-tools evolve....
This should be enough from the SGMLtools distribution to make theSGMLtools happy.
The only symlink you need now is dist/birddoc -> dist/sgmltool. I'mconvinced it could be avoided by renaming the directory instead, but I'drather avoid it due to CVS pecularities.