top-level: Deprecate top-level {build,host,target}Platform
#46059
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OK @dezgeg, I'm starting with these since these are the ones we agree on. I'll backport to 18.09 too, if you approve of this.
Motivation for this change
I don't know when we can/should remove them, but this at least gets people to stop using them. The preferred alternatives also date back to 17.09 so writing forward-compatable code without extra conditions is easy.
Things done
sandbox
innix.conf
on non-NixOS)nix-shell -p nox --run "nox-review wip"
./result/bin/
)nix path-info -S
before and after)