The files cupsfilters/kmdevices.h and cupsfilters/kmdevices.cpp form
an interface for Kolor Manager, a KDE system settings component for
color management with Oyranos.
Kolor Manager is unmaintained for several years, same for Oyranos. The
kmdevices.* are not included in the build of libcupsfilters, only
shipped for optional use (requires uncommenting a line in
colormanager.c) and no one complained about their non-inclusion in the
build. They even contain a typo which would prevent them from
building. So one can assume that no one cares about them.
Therefore they get removed now, before the cups-filters 2.x release.