- define _udevrulesdir only if not already defined
- run %udev_rules_update, if defined.

- Update to version 0.99.0:
+ Notes:
- This version contains major API changes. Use the 0.9.*
versions if you want to keep using the old API.
+ New Features:
- Add WarningLevel and IconName properties to all devices
- Add DisplayDevice composite battery
- Enforce critical battery policy on the daemon side
+ Bugfixes:
- Reduce client-side and daemon-side wake-ups
- Emit PropertiesChanged signals
- Register objects on the bus once they've been setup
- Clamp percentage for overfull batteries
+ Feature Removals:
- Remove battery recall support
- Remove QoS support
- Remove OnLowBattery property (use WarningLevel instead)
- Remove DeviceChanged and Changed signals (PropertiesChanged
signals are sent instead)