Merge pull request #27511 from bcdarwin/fix-elastix

elastix: change platforms to "linux" from "unix"

pkgs/development/libraries/science/biology/elastix/default.nix

···
     homepage = http://elastix.isi.uu.nl/;
     description = "Image registration toolkit based on ITK";
     maintainers = with maintainers; [ bcdarwin ];
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     license = licenses.asl20;
   };
 }