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Nix: Remove boost env vars
Because https://github.com/NixOS/nixpkgs/issues/86131 is fixed --- this is not actually a Nix-version-specific thing, but a Nixpkgs-specific thing. Counterpart to https://github.com/NixOS/nix/pull/12772/commits/459fb59493d62b97e7e5219d542fcddc62aab0b5