Drop patches which have been applied upstream:
- debian/patches/Fix-CPUShares-configuration-option.patch
- debian/patches/Recognize-discard-option-in-etc-crypttab.patch
- debian/patches/Start-ctrl-alt-del.target-irreversibly.patch
- debian/patches/core-dbus-properly-export-cgroup-properties-on-socke.patch
- debian/patches/initctl-use-irreversible-jobs-when-switching-runleve.patch
- debian/patches/journald-DO-recalculate-the-ACL-mask-but-only-if-it-.patch
- debian/patches/polkit-Avoid-race-condition-in-scraping-proc.patch
- debian/patches/systemctl-mangle-names-when-avoiding-dbus.patch
- debian/patches/systemd-tmpfiles-setup-dev-remain-after-exit.patch

Drop patches which no longer work after the cgroup rework:
- debian/patches/Clean-up-closing-empty-sessions-when-not-running-und.patch
- debian/patches/Make-sd_login_monitor_new-work-for-logind-without-sy.patch

Drop patch which no longer applies and is supposed to be fixed:
- debian/patches/Avoid-sending-sigterm-to-session-leader.patch