FFmpeg/libav have dropped AVIO_RDONLY in favor of AVIO_FLAG_READ. This
patch fixes that in MPD.

Conflicts:
	src/decoder/ffmpeg_decoder_plugin.c

Keep those when scanning for empty directories.  The check in
playlist_vector_is_empty() was missing.

It's a no-op and deprecated.

URLContext is deprecated.

g_path_get_dirname() returns "." when there is no directory name in
the given path.  This patch adds a workaround for that.

avcodec_decode_audio3() has been added in libavformat 52.25.0, and the
predecessor avcodec_decode_audio2() has been deprecated.

fixes build with lavc 53.

For ffmpeg < 0.5.  Copied from libavutil 0.5.

avcodec_decode_audio3() has been added in libavformat 52.25.0, and the
predecessor avcodec_decode_audio2() has been deprecated.

All modern distros ship 0.5, so there's no need to support old and buggy
ffmpeg versions.

Conflicts:
	NEWS
	configure.ac

Conflicts:
	NEWS
	configure.ac
	src/listen.c

There is a global despotify session, so it should not be initialized
until needed.

These fixes were mostly generated with `codespell' [0] and manually
reviewed.

[0] http://git.profusion.mobi/cgit.cgi/lucas/codespell/

For spotify playlists or tracks. Uses a spt uri, so with mpc you can
add playlists with

  mpc load spt://spotify:user:simon.kagstrom:playlist:3SUwkOe5VbVHysZcidEZtH

For Spotify tracks. Uses a spt URI, so with mpc you can play tracks
with e.g.,

  mpc add spt://spotify:track:5qENVY0YEdZ7fiuOax70x1
  mpc play

Uses the pcm_decoder_plugin for the output

Used to connect and authenticate to despotify. Provides a singleton
session and a desptoify-track-to-tags function.

Fix clang warning.

Use audio_format_mask_valid() to verify a mask.

Thanks to clang for complaining.

E.g., spotify isn't seekable.

Otherwise the song playing might go on forever.

Otherwise OGGs can't be played.

Should fix build errors for Win32.

Conflicts:
	Makefile.am
	NEWS
	configure.ac