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a lot of code everywhere a filter_t chain is used ("video filter2":
vout core, transcode, chain.c video filter; "sub filter": spu_Init;
"audio filter2": transcode; the other types of filter_t objects are
never chained)

Btw, why aren't "audio filter2" filters used anywhere in the aout core?

While reading this, you will find a bunch of:
  while (find (VLC_OBJECT_INTERFACE))
     release; release;

These are of course plain BUGS (which are neither introduced nor fixed
by this commit). Imagine, for instance, what happens if two threads run
the code above at the same time... they end up releasing the interface
once too many.

Add some missing symbols in a blind attempt to fix the buildbots. Feel free to revert if this is wrong.

Still not working though

Should fix strlcpy() issues on Linux, but Win32 is surely still totally
broken by d754b405

Please review whether this patch is correct as it adds internal functions using VLC_EXPORT.

Also fix an overflow in strndup().

It has almost nothing in common with the Unix main code anyway.

This avoids having to link a few plugins with libintl on platforms where
it's not built-in libc. This also factors the internal use of
dgettext("vlc", ...).

(CPU features don't change across libvlc instances)

Remove VLC_META_ENGINE_*
Don't use VLC_META_INFO_CAT
Avoid using input_Item{Add,Get}Info
Remove disabled code in cdda
Remove "meta fetcher":
    There was only 1 module (not) implementing it (musicbrainz)
    Reduces complexity in playlist core
Use a more consistent naming
Factorize QT4 sorting and column display code
Remove unused members