[gthumb/gthumb-3-4] gthumb 3.4.4 fails post build check 64bit-portability-issue

[Paolo Bacchilega <paobac src gnome org>]

commit c2eecefdb7802312366c038bd6af4cb4f69f029f
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Tue Oct 11 18:29:25 2016 +0200

    gthumb 3.4.4 fails post build check 64bit-portability-issue
    
    [bug #772739]

 gthumb/gth-image-viewer.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gthumb/gth-image-viewer.h b/gthumb/gth-image-viewer.h
index 8b03a33..c7cafc3 100644
--- a/gthumb/gth-image-viewer.h
+++ b/gthumb/gth-image-viewer.h
@@ -222,6 +222,8 @@ void           gth_image_viewer_enable_zoom_with_keys    (GthImageViewer
 void           gth_image_viewer_clicked                  (GthImageViewer        *viewer);
 void           gth_image_viewer_set_tool                 (GthImageViewer        *viewer,
                                                          GthImageViewerTool    *tool);
+GthImageViewerTool *
+              gth_image_viewer_get_tool                 (GthImageViewer        *viewer);
 
 /* Scrolling. */