types CHANGE make internal compilation flags public for the extension plugins

Extension plugins perform compilation so they need also to know the
compilation options used by libyang.
diff --git a/src/tree_data.h b/src/tree_data.h
index c9456d6..0770f08 100644
--- a/src/tree_data.h
+++ b/src/tree_data.h
@@ -686,6 +686,7 @@
  *
  * @param[in] node1 The first node to compare.
  * @param[in] node2 The second node to compare.
+ * @param[in] options Various @ref datacompareoptions.
  * @return LY_SUCCESS if the nodes are equivalent.
  * @return LY_ENOT if the nodes are not equivalent.
  */