Simplify UPnp detection
Simplify goom2k4 detection

MLP track detection is weak and will fail from time to time. If anyone
know a reliable way I am interested.
Only playing directly the AOB files is supported.

Audio channels in AOB can be separated into two groups with different
properties (bits/sample and/or samplerate). In this case, the second group
is ignored.

This hasn't work for quite some time and we have projectM module.
Moreover, noone complained.

This reverts commit 33835542.
It segfaults as p_next is now uninitialized.

==25869== Conditional jump or move depends on uninitialised value(s)
==25869==    at 0x5078332: GetNextItem (tree.c:441)
==25869==    by 0x5078D7A: playlist_GetNextLeaf (tree.c:362)
==25869==    by 0x5071CFE: ResetCurrentlyPlaying (thread.c:197)
==25869==    by 0x5072952: Thread (thread.c:596)
==25869==    by 0x577AFC6: start_thread (in /lib/libpthread-2.7.so)
==25869==    by 0x5EE65AC: clone (in /lib/libc-2.7.so)

Rename types and add compatibility macro for old libass versions.
Signed-off-by: Laurent Aimar <fenrir@videolan.org>

Remove external thread for fontdbbuiler, and do it on load. First run is
slower on windows, so show dialog about it to user. Following runs
should be much faster (atleast according to my own tests).

So on optimal case user sees that font-dialog only once when initial
cache is created.

One idea was to load freetype-module on start of vlc, so it would create
that cache on start of vlc instead of start of video (when showing
title), and could be changed to show something like 'VLC is starting
first time, please wait a while...' or so.

Feel free to revert/change/complain about this if it doesn't work for
you.

This partially reverts f1175e71.

This is just pedantic. Nobody links against plugins anyway.

Configure: update macro to deal with the case where you want --enable-foo, but the module name is not foo.

So, add a new argument that can be empty
This happens for --enable-dv (access_dv) --enable-shout (stream_output_shout)