Fix warnings

src/libvlc.h

@@ -87,7 +87,7 @@ uint32_t CPUCapabilities( void );
  * @param psz_type object type name
  * @return the created object, or NULL.
  */
-extern vlc_object_t *
+extern void *
 vlc_custom_create (vlc_object_t *p_this, size_t i_size, int i_type,
                    const char *psz_type);
 

src/misc/objects.c

@@ -104,7 +104,7 @@ static void vlc_object_yield_locked( vlc_object_t *p_this );
 static vlc_mutex_t    structure_lock;
 static vlc_object_internals_t global_internals;
 
-vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
+void *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
                          int i_type, const char *psz_type )
 {
     vlc_object_t *p_new;

src/video_output/vout_subpictures.c

@@ -35,6 +35,7 @@
 #include <vlc_block.h>
 #include <vlc_filter.h>
 #include <vlc_osd.h>
+#include "../libvlc.h"
 
 /*****************************************************************************
  * Local prototypes