xcbproto: Meson added + doc

[Peter Harris]

> For the python related utilities: find_vpython.sh (find a python
> interpreter matching a version condition) and compile_py.sh (self
> explanatory), they have to be distributed.

I haven't looked at your repository, so please forgive me if I've missed
something important. But shouldn't these be handled by the Meson Python
module instead of shelling out to a script?

https://mesonbuild.com/Python-module.html

Peter Harris
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