This is an internal copy of libcanberra 0.14-0maemo4+0m5, i.e. the version
used in Maemo Fremantle PR1.2.

To make the ringtone play at the proper volume we need to tag the pulse
stream, but the system version of libcanberra drops some of the properties
we need. There seem to be no way to work it around, so I had to include an
internal copy of the library.
