Put native system in extra platforms if --system is used #5003
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When we use a custom --system arg, we want Nix to also be able to utilize it’s native architecture for builds.
The best use case for this is M1 macOS users who want to prefer x86_64 for compatibility, but sometimes use
aarch64-darwin too. They can now add:
system = x86_64-darwin
to $HOME/.config/nix/nix.conf without sacrificing ability to build aarch64-darwin.