mpd: update to 0.23.17

mpd: update to 0.23.17

Drop 020-string-view.patch: mpd 0.23.17 uses std::string_view directly
in src/tag/GenParseName.cxx, making the patch redundant.

Changes since 0.23.16:
- Optimize the "albumart" command to send larger chunks when available
- Explicitly disallow 'idle' and 'noidle' commands in command lists
- Require libnfs 4.0 or later for NFS storage support
- Trigger inotify database update after symlink creation
- Prefer FFmpeg over sndfile and audiofile for DTS-WAV support
- Add support for libfmt 11.1

Signed-off-by: Alexandru Ardelean <redacted>