audio/strawberry: Update to 1.2.2

Remove the GSTREAMER and VLC options. GStreamer is now the only
supported backend.

Convert the TEST option to the CMake testing framework.

https://github.com/strawberrymusicplayer/strawberry/releases/tag/1.2.1
https://github.com/strawberrymusicplayer/strawberry/releases/tag/1.2.2