castxml: abandon maintenance

Since the incidents from @ghost at https://github.com/NixOS/nixpkgs/pull/311950,
I do not feel well about the weariful, boring and unworthy work of keeping this
package for free.

pkgs/by-name/ca/castxml/package.nix

@@ -62,7 +62,7 @@ stdenv.mkDerivation (finalAttrs: {
     description = "C-family Abstract Syntax Tree XML Output";
     license = lib.licenses.asl20;
     mainProgram = "castxml";
-    maintainers = with lib.maintainers; [ AndersonTorres ];
+    maintainers = [ ];
     platforms = lib.platforms.unix;
   };
 })