New review comment by BenJarg on void-packages repository

https://github.com/void-linux/void-packages/pull/34647#discussion_r794938908

Comment:
It seems it's more complicated than that, and make take a bigger effort. After patching that, I also had to change a few `__GNUC__` s to `__GLIBC__`, and am still running into random compilation errors like `error: invalid conversion from 'int*' to 'socklen_t*'`. `xrootd` might be a little too tied to glibc.