Replaced playlist_internal.h by libvlc.h in control/playlist.c

Only libvlc_priv was needed.

src/control/playlist.c

@@ -22,15 +22,13 @@
  *****************************************************************************/
 
 #include "libvlc_internal.h"
+#include "libvlc.h"
 
 #include <vlc/libvlc.h>
 #include <vlc_playlist.h>
 
 #include <assert.h>
 
-#define __LIBVLC__
-#include "../playlist/playlist_internal.h"
-
 #define PL (libvlc_priv (p_instance->p_libvlc_int)->p_playlist)
 
 static inline int playlist_was_locked( libvlc_instance_t *p_instance )