Extra file in DESTDIR with MKRUMP=no

["Ian D. Leroux" <idleroux%fastmail.fm@localhost>]

Building with fresh tools/ and obj/ leads to:

=======  1 extra files in DESTDIR  =========
Files in DESTDIR but missing from flist.
File is obsolete or flist is out of date ?
------------------------------------------
./usr/libdata/debug/usr/tests/fs/fifofs
=========  end of 1 extra files  ===========

Looking at the set lists, this file is supposed to depend on rump,
which, given that I build with MKRUMP=no, is plausibly why the set list
check is complaining.  Is the set list wrong, or is there a missing
conditional in whatever makefile controls the installation of this file?
(and where does it come from anyway? a quick "find . -name fifofs"
turned up a directory with atf tests but nothing that looked like a
static data file that would go in libdata).

--
IDL