Merge pull request #45338 from mnacamura/feedgnuplot

feedgnuplot: fix build

pkgs/tools/graphics/feedgnuplot/default.nix

···
     sha256 = "1bjnx36rsxlj845w9apvdjpza8vd9rbs3dlmgvky6yznrwa6sm02";
   };
 
+  outputs = [ "out" ];
+
   nativeBuildInputs = [ makeWrapper gawk ];
 
   buildInputs = [ gnuplot perl ]