Adding hourglass to kano-updater

@pazdera the library is installed as ```libkdesk-hourglass.so```:

 * https://github.com/KanoComputing/kdesk/blob/export-library/debian/libkdesk-dev.install#L1

The linker translates ```-lkdesk-hourglass``` to match that name which will be resolved at load time. Do you think I'm missing something?