Merge pull request #1 from amoskvin/fix-underlinking

Find CUPS and link to it explicitly
Merge pull request #2 from amoskvin/autodetect-backend-dir

Auto-detect cups backend directory correctly
Fallback mode if ck-list-sessions not work
Small fixes for README.

Packet -> package, distributive -> distribution.
Merge pull request #3 from sddm/master

Small fixes for the README.