/etcSDDM reads files in alphabetical order from /usr/lib/sddm/sddm.conf is read last, with files in.d/,
then /etc/sddm.conf.d/ and /etc/sddm.conf.d/ and The latest occurence takes
/usr/lib/sddm/sddm.conf.d/ taking precedence.
The paths in CMakeLists are copied from sddm.