Make sure that the log callback is installed.

Use the duration of the stream we're actually decoding - not the
"global" attribute AVFormatContext::duration which may differ.

Fixes regression by commit 7c8038e2

Allow multiple targets to share a library directory tree.

setvbuf() does not seem to have an effect on Windows.

Make sure everything gets logged right away.  No delays because
stdio's buffer is not yet full.

Without MEM_COMMIT, the reserved address space is not accessible, and
MPD crashes.

The definition of the playlist_plugin struct member of the embcue
plugin was incorrect.