Just setupLogOutput and redirect things to the logs before
spawning the main process.  We've already daemonized at this
point, so we've already proven that we can fork, but we haven't
done it yet.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4353 09075e82-0dd4-0310-85a5-a0d7c8717e4f