New comment by ScrelliCopter on void-packages repository

https://github.com/void-linux/void-packages/pull/27915#issuecomment-769397319

Comment:
@Piraty 
> Afte i looked into genie's build system, I also require you to put comments on the parts where you build for the host and why
I added a small explanation to the start of `do_configure` that should make the intention clear.
> and ideally guard that by testing `$CROSS_BUILD`
I put `CC="${CC_host:-$CC}"` in the make that runs on the host and switched to the `gnu-makefile` build_style to handle the actual build. Tested & seems to work for both native & cross builds. Should that handle every case?