New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/22785#discussion_r457404156

Comment:
So, the problem here is that `rustup` doesn't even know that `armv6l-musl` exists, so it errors out with a rather cryptic error. For the others, we might not have upstream binaries, but `rustup` knows about them and can work normally. I can try to build it for mips / armv5 to check those too.