Add some header comments and an introductory comment explaining how to
check that no rule ignores files present in the repository.
Signed-off-by: Love Hornquist Astrand <lha@h5l.org>
These files are included in the repository and don't have makefile
rules to generate them, so don't ignore them.
Signed-off-by: Love Hornquist Astrand <lha@h5l.org>
Russ Allbery