Update for addition of get_virtual_call_data_func and call_virtual_func to GDExtensionClassCreationInfo2 #1246 
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This allows godot-cpp to continue working after merging Godot PR godotengine/godot#80671
godot-cpp doesn't actually need the feature added in that PR; it's for languages that don't have a way to automatically generate new functions with C linkage, whereas C++ can do that just fine. But since that PR adds two new fields to the
GDExtensionClassCreationInfo2struct, so we need to set them tonullptrin order to keep working with Godotmaster.