Another build failure for MKDEBUG=yes

[Paul Goyette <paul%whooppee.com@localhost>]

Even after Roy's most recent commits (sources updated on 2020-09-30 at
20:42:53 UTC) I am seeing the following error:

...
checkflist ===> distrib/sets

=======  3 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File is obsolete or flist is out of date ?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/net/if_tap
./usr/libdata/debug/usr/tests/net/if_tap/rump_open_tap.debug
./usr/libdata/debug/usr/tests/net/if_vether
=========  end of 3 extra files  ===========

--- checkflist ---
*** [checkflist] Error code 1
...

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