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Also, make it clearer what is shared and instance-specific

So,
libvlc_t ==> libvlc_global_t
vlc_t ==> libvlc_int_t (internal instance)

p_object->p_libvlc ==> p_object->p_libvlc_globale
p_object->p_vlc ==> p_object->p_libvlc

VLC_OBJECT_VLC ==> VLC_OBJECT_LIBVLC

And by the way, there is some cleanup required :) (ie, some things are created in the global object instead of the instance-specific one)

Shame on me

  so that it is cleanly built before all modules
  (step toward buildable shared libvlc on Win32)
- Don't build position dependant code when building shared libvlc
  (that was a big waste of time)
- Link builtin modules with vlc rather than libvlc