Revision 472956

audio/openal-soft: Cleanup options

- Drop bogus FLUIDSYNTH option (MIDI support was removed in 1.17.0)
- The sndio backend is missing capture support.  This can lead to crashes
  when there is no usable fallback backend available.  As a workaround
  always enable the OSS backend when the sndio backend is wanted.
- Prioritize sndio over OSS when it's enabled which should
  make it unnecessary to fiddle with config files when building
  with both SNDIO and OSS.
- Turn off dynamically loading backend libs via dlopen
- Correct lib depends
- Update pkg-descr
- Take maintainership