[libdazzle] tree-builder: add dzl_tree_builder_new()

[Christian Hergert <chergert src gnome org>]

commit e5dd82845db1c2b40b6bc929e713a50cb51d1b14
Author: Christian Hergert <chergert redhat com>
Date:   Sat Dec 2 15:39:39 2017 -0800

    tree-builder: add dzl_tree_builder_new()
    
    This can be used when only signals are used on the tree builder for
    creating nodes.

 src/tree/dzl-tree-builder.c |    6 ++++++
 src/tree/dzl-tree-builder.h |    4 +++-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/src/tree/dzl-tree-builder.c b/src/tree/dzl-tree-builder.c
index dd8d6d0..2006ba6 100644
--- a/src/tree/dzl-tree-builder.c
+++ b/src/tree/dzl-tree-builder.c
@@ -370,3 +370,9 @@ static void
 dzl_tree_builder_init (DzlTreeBuilder *builder)
 {
 }
+
+DzlTreeBuilder *
+dzl_tree_builder_new (void)
+{
+  return g_object_new (DZL_TYPE_TREE_BUILDER, NULL);
+}
diff --git a/src/tree/dzl-tree-builder.h b/src/tree/dzl-tree-builder.h
index ae573cf..f6a5797 100644
--- a/src/tree/dzl-tree-builder.h
+++ b/src/tree/dzl-tree-builder.h
@@ -57,7 +57,9 @@ struct _DzlTreeBuilderClass
 };
 
 DZL_AVAILABLE_IN_ALL
-DzlTree *dzl_tree_builder_get_tree (DzlTreeBuilder *builder);
+DzlTree        *dzl_tree_builder_get_tree (DzlTreeBuilder *builder);
+DZL_AVAILABLE_IN_3_28
+DzlTreeBuilder *dzl_tree_builder_new      (void);
 
 G_END_DECLS