New comment by st3r4g on void-packages repository

https://github.com/void-linux/void-packages/pull/22008#issuecomment-629634493

Comment:
I think `libXext-devel xorgproto` are required internally and not propagated to public headers, but meaningful testing is annoying because these are also pulled in by other -devel dependencies (when trying to build e.g. `mesa-demos`) EDIT: `mesa-demos` requires xext by itself, so useless to test with it, tested compiling `xdriinfo` and `glmark2`