Skipping those songs silently will confuse the client, because
commands specifying the song index within a playlist
(e.g. playlistdelete) will be out of sync.

This copies spl_print()'s behavior to playlist_file_print().

Was hard-coded to "auto", and the macro parameter was ignored (in the
help text).

If no name is specified, it'll use the name of the first activity of the
AndroidManifest.xml. And we don't want the apk to be called Settings.apk.

Not used.

Version 2.5 fixed an API oddity, however it broke API compatibility,
at least with C++.  Disable the workaround when a libavformat version
is detected that is recent enough.

The "::" to explicitly refer to the global namespace appeared like a
good idea in C++, but it breaks with C libraries that implement
standard functions using macros (e.g. musl).

Require the version 2 which has a more sane API.

Since version 2.32, g_thread_init() is deprecated and a no-op.  Let's
upgrade that (optional) dependency so we can remove all those
g_thread_init() calls.

Only very few (minor) features still depend on GLib.