Bump to 2.16.4

Bump to 2.16.4
* Follow the preferred sound device as set in control centre (Bastien Nocera)
* Detect FreeDB albums better (thanks David Mandelberg)
* Make path selector accessible (Rich Burridge)
* Use xdg-data-dirs to set a nice default directory on systems that support it (BN)
* Init threading earlier (Christian Kirbach)
* Transcode errors to UTF-8 (Pascal Terjan)
* Remove Application category from desktop file
* Fix build in srcdir!=builddir (Loic Minier)

Package-Manager: portage-2.1.2.5