New review comment by lane-brain on void-packages repository

https://github.com/void-linux/void-packages/pull/28785#discussion_r576574137

Comment:
these are for the most part lifted from the original template to match how gcc is configured in void-packages. my rationale is that if we are rebuilding the compiler for the JIT, the JIT target configuration ought to match the original build as closely as possible. what I don't know is whether these flags aren't relevant if we aren't bootstrapping