Do not modify the code in this directory. It has been copied from its upstream
git repo [1]. When submodules are introduced this directory can be made a
submodule, but until then a verbatim copy is better than inlining the code in
the toplevel wscript.

[1] https://gitlab.com/karllinden/waf-autooptions