modules/services/printing/cupsd.nix: ensure that /etc/cups exists before the daemon is run
modules/services/printing/cupsd.nix: ensure that /etc/cups exists before the daemon is run

CUPS is really unhappy when /etc/cups doesn't exist, and without that
directory it's going to mess up file permissions of /nix/store, the web
front-end won't work, and probably all kinds of other stuff is broken
that I didn't notice yet. :-(

git-svn-id: 71c8032c709790ec749031c4215f8515ac00dc5a@29452 70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb

falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos