New review comment by non-Jedi on void-packages repository

https://github.com/void-linux/void-packages/pull/24097#discussion_r476692944

Comment:
[Julia heavily patches the llvm it uses](https://github.com/JuliaLang/julia/tree/master/deps/patches). Using llvm without those patches results in julia being non-functional. That one at least must be allowed to be vendored. In the past, julia would instantly segfault with an unpatched llvm, so if it doesn't do that things must be improving. Maybe in the future we'll even be able to unvendor it.