Remove aterm28 from release-small, it's broken

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pkgs/top-level/release-small.nix
··· 20 20 at = linux; 21 21 atlas = linux; 22 22 aterm25 = all; 23 - aterm28 = all; 24 23 autoconf = all; 25 24 automake = all; 26 25 avahi = allBut cygwin; # Cygwin builds fail