Fix compiler warning.

src/text/strings.c

@@ -695,7 +695,7 @@ char *str_format_meta( vlc_object_t *p_object, const char *string )
                     if( p_item && p_item->p_stats )
                     {
                         vlc_mutex_lock( &p_item->p_stats->lock );
-                        snprintf( buf, 10, "%d",
+                        snprintf( buf, 10, "%"PRIi64,
                                   p_item->p_stats->i_displayed_pictures );
                         vlc_mutex_unlock( &p_item->p_stats->lock );
                     }