[tepl] Add some missing G_GNUC_INTERNAL

[Sébastien Wilmet <swilmet src gnome org>]

commit 706685b8bd4fc15238329620d3ce7551d270d74e
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Nov 25 16:05:24 2017 +0100

    Add some missing G_GNUC_INTERNAL

 tepl/tepl-close-confirm-dialog-single.h |    2 ++
 tepl/tepl-utils.h                       |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/tepl/tepl-close-confirm-dialog-single.h b/tepl/tepl-close-confirm-dialog-single.h
index 4d332ce..354a447 100644
--- a/tepl/tepl-close-confirm-dialog-single.h
+++ b/tepl/tepl-close-confirm-dialog-single.h
@@ -25,10 +25,12 @@
 
 G_BEGIN_DECLS
 
+G_GNUC_INTERNAL
 void           _tepl_close_confirm_dialog_single_async         (TeplTab             *tab,
                                                                 GAsyncReadyCallback  callback,
                                                                 gpointer             user_data);
 
+G_GNUC_INTERNAL
 gboolean       _tepl_close_confirm_dialog_single_finish        (TeplTab      *tab,
                                                                 GAsyncResult *result);
 
diff --git a/tepl/tepl-utils.h b/tepl/tepl-utils.h
index e806387..f1fd40b 100644
--- a/tepl/tepl-utils.h
+++ b/tepl/tepl-utils.h
@@ -30,6 +30,7 @@ G_BEGIN_DECLS
 
 /* String utilities */
 
+G_GNUC_INTERNAL
 gchar *                _tepl_utils_str_middle_truncate                 (const gchar *str,
                                                                 guint        truncate_length);
 
@@ -51,6 +52,7 @@ gchar *               _tepl_utils_get_fallback_basename_for_display   (GFile *location);
 
 /* Widget utilities */
 
+G_GNUC_INTERNAL
 GtkWidget *    _tepl_utils_create_close_button                 (void);
 
 G_GNUC_INTERNAL