- update to 0.23.15:
* ffmpeg: fix build failure with FFmpeg 6.1
* alsa: limit buffer time to 2 seconds
* flac: fix scanning files with non-ASCII names on Windows
* mad: fix calculation of LAME peak values
* wasapi: fix problem setting volume
* more libfmt 10 fixes
* fix auto-detected systemd unit directory

- Removed fix-build-ffmpeg5.patch.
* fix crash bug in "albumart" command (0.22.7 regression)
* the default log_level is "default", not "info"
* include command name in error responses