not found, and fcc when the name starts with a '/'. Almost matches
behavior in other parts of the code, but can't really do that since
the name passed in to this function may only contain the prefix itself
without the colon.
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@16306 ec53bebd-3082-4978-b11e-865c3cabbd6b