(cherry picked from commit 0e4d1695)

If you want to try it and report bugs use --enable-projectm.

The spec says that the 2nd round of packets need to have the 1st 4 bytes be the
timestamp (potentially zero) and the next 4 bytes be zero. The bytes after that
should be random. (not necessarily cryptographically secure, just for
establishing a unique echo response in the 3rd round of packets).
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

Add rockbox's cover.jpg to the list of known files
Give the possibility to add a custom filename with --album-art-filename
Properly handle URIs on Win32 and other
Cleaner code

(cherry picked from commit 1cc1d3ab74fac41f348d772d8685203b82577d0e)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This fixes a corner case:
A: rdlock -> OK
B: wrlock -> sleeps
A: rdlock -> dead lock

Signed-off-by: Laurent Aimar <fenrir@videolan.org>

(cherry picked from commit 3aa5a9f8)