vlc/libvlc.h: Make media_descriptor_duplicate Public.

include/vlc/libvlc.h

@@ -186,6 +186,8 @@ VLC_PUBLIC_API void libvlc_media_descriptor_release(
 VLC_PUBLIC_API char * libvlc_media_descriptor_get_mrl( libvlc_media_descriptor_t * p_md,
                                                        libvlc_exception_t * p_e );
 
+VLC_PUBLIC_API libvlc_media_descriptor_t * libvlc_media_descriptor_duplicate( libvlc_media_descriptor_t * );
+
 /**
  * Read the meta of the media descriptor.
  * \param p_meta_desc the media descriptor to read

src/control/libvlc_internal.h

@@ -295,9 +295,6 @@ VLC_EXPORT (void, libvlc_media_instance_destroy,
 VLC_EXPORT (libvlc_media_descriptor_t *, libvlc_media_descriptor_new_from_input_item,
                         ( struct libvlc_instance_t *, input_item_t *, libvlc_exception_t * ) );
 
-VLC_EXPORT (libvlc_media_descriptor_t *, libvlc_media_descriptor_duplicate,
-                        ( libvlc_media_descriptor_t * ) );
-
 VLC_EXPORT (void, libvlc_media_descriptor_set_state,
                         ( libvlc_media_descriptor_t *, libvlc_state_t, libvlc_exception_t * ) );