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nixos/release: add i686-linux mesa to channel blockers
Apart from being still a useful package, this keeps a basic sanity check for i686, now that we dropped the installation image, etc. Our RFC mandates that i686 stdenv is a channel blocker: https://github.com/NixOS/rfcs/blob/master/rfcs/0046-platform-support-tiers.md#tier-3-1