[gnome-builder/wip/gtk4-port] libide/tree: remove unused prototype

[Christian Hergert <chergert src gnome org>]

commit a11301005622e46357628dfa911315a04c3514fb
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 30 15:18:26 2022 -0700

    libide/tree: remove unused prototype

 src/libide/tree/ide-tree.h | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/libide/tree/ide-tree.h b/src/libide/tree/ide-tree.h
index 17e3fc33c..ef4f045e4 100644
--- a/src/libide/tree/ide-tree.h
+++ b/src/libide/tree/ide-tree.h
@@ -63,7 +63,5 @@ void           ide_tree_collapse_node        (IdeTree     *self,
 IDE_AVAILABLE_IN_ALL
 gboolean       ide_tree_node_expanded        (IdeTree     *self,
                                               IdeTreeNode *node);
-IDE_AVAILABLE_IN_ALL
-GtkDropTarget *ide_tree_get_drop_target      (IdeTree     *self);
 
 G_END_DECLS