On OpenBSD console-kit-daemon isn't started by the init system, so try to start
it from sddm.

Index: src/daemon/DaemonApp.cpp
--- src/daemon/DaemonApp.cpp.orig
+++ src/daemon/DaemonApp.cpp
@@ -50,6 +50,8 @@ namespace SDDM {
         // set testing parameter
         m_testing = (arguments().indexOf(QStringLiteral("--test-mode")) != -1);
 
+        QDBusConnection::systemBus().interface()->startService(QStringLiteral("org.freedesktop.ConsoleKit"));
+
         bool consoleKitServiceActivatable = false;
         QDBusReply<QStringList> activatableNamesReply = QDBusConnection::systemBus().interface()->activatableServiceNames();
         if (activatableNamesReply.isValid()) {
