travesty: add C++ variants of v3_component_handler[2] structs

Signed-off-by: falkTX <falktx@falktx.com>

distrho/src/travesty/edit_controller.h

@@ -1,6 +1,6 @@
 /*
  * travesty, pure C VST3-compatible interface
- * Copyright (C) 2021-2022 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2021-2023 Filipe Coelho <falktx@falktx.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any purpose with
  * or without fee is hereby granted, provided that the above copyright notice and this
@@ -132,6 +132,14 @@ static constexpr const v3_tuid v3_midi_mapping_iid =
  * C++ variants
  */
 
+struct v3_component_handler_cpp : v3_funknown {
+	v3_component_handler comp;
+};
+
+struct v3_component_handler2_cpp : v3_funknown {
+	v3_component_handler2 comp2;
+};
+
 struct v3_edit_controller_cpp : v3_funknown {
 	v3_plugin_base base;
 	v3_edit_controller ctrl;