Also include the XScreenSaver libraries (confusingly named libXss) which are...

Also include the XScreenSaver libraries (confusingly named libXss) which are needed by Kaffeine as well.

Ref T10931
2 jobs for master
Status Job ID Name Coverage
  Build
manual #7515
docker allowed to fail manual
kdeorg/appimage-base
manual #7516
docker allowed to fail manual
kdeorg/staticweb