Found with cppcoreguidelines-special-member-functions
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Fixes protocol breakage after commit 0440c41c

libfmt is too clever for the MPD protocol!

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1175

Regression by commit 471c37be

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1135

Replaces FormatProtocolError().

From libavformat/mov.c.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1173

This mapping was added 11 years ago in commit 766b9fd4, but FFmpeg
doesn't appear to support it.

These were added 11 years ago in commit 766b9fd4, but I cannot find
any evidence in the FFmpeg repository that these names were ever
supported.  This commit adds the tags as they are currently present in
libavformat/mov.c.

When updating everything, this did work, but if updating only a
subdirectory, the ".mpdignore" in the parents were not used.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1172

Fixes broken libavahi-client timeouts.