The inverted check was introduced by commit 46d00dd8, and commit
8ad17d25 added a check for the wrong variable.  D'oh!

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1303

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1297

MPD supports only 8 channels, so MAX_CHANNELS is enough, the array
doens't need to be SPA_AUDIO_MAX_CHANNELS (which is 64).

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1297

.. instead of DeferEvent, which is not thread-safe.  This caused
various playback problems, which was initially caused by the
DeferEvent/InjectEvent split in commit 774b4313

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1298

Currently fails in class NfsFileReader due to
https://github.com/MusicPlayerDaemon/MPD/issues/1298

With libfmt versions older than 7, this leads to an endless recursion
between Error() and FmtError(), resulting in a crash due to stack
overflow.  D'oh!

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1295

Should have been removed by commit a8087dc1

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1294

This commit also increases the PROTOCOL_VERSION so clients can detect
the availability of the feature.

During the libfmt migration, I converted "%1.3f" to just "{:1.3}"
without the "f" suffix, but libfmt defaults to scientific notation,
which can break some MPD clients.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1291

Requires PipeWire 0.3.32.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1283

This bug caused a 9 second offset in all time stamps.  Due to that,
the Snapcast server thought the chunks are too old and discarded them.

Fixes https://github.com/MusicPlayerDaemon/MPD/discussions/1287

This replaces the output parameter (which is bad API design).  As a
side effect, it fixes the bad [[gnu::pure]] attribute added by commit
a636d212 which caused optimizing compilers to miscompile calls to
that function.  "Pure" functions can be assumed to have no output
arguments, so the compiler can assume the function doesn't modify
them.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1282