New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/26962#issuecomment-761870916

Comment:
I think that only makes it set the `-I` flags appropriately. For `clang`, it's a singler executable that can target all archs, so configuring the target works by passing `-march` flags and such (and it defaults to the host if none are passed) and those are what's missing.