variables: privatize callback type enumeration

include/vlc_common.h

@@ -383,12 +383,6 @@ typedef int ( * vlc_list_callback_t ) ( vlc_object_t *,      /* variable's objec
                                         vlc_value_t *,      /* new/deleted value  */
                                         void *);                 /* callback data */
 
-typedef enum
-{
-    vlc_value_callback,
-    vlc_list_callback
-} vlc_callback_type_t;
-
 /*****************************************************************************
  * OS-specific headers and thread types
  *****************************************************************************/

src/misc/variables.c

@@ -892,6 +892,12 @@ int var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
     return var_GetChecked( p_this, psz_name, 0, p_val );
 }
 
+typedef enum
+{
+    vlc_value_callback,
+    vlc_list_callback
+} vlc_callback_type_t;
+
 static void AddCallback( vlc_object_t *p_this, const char *psz_name,
                         callback_entry_t entry, vlc_callback_type_t i_type )
 {