evcxr: skip test broken by rust 1.69 (#230089)

Closes #229524
See also https://github.com/evcxr/evcxr/issues/294

While it's unfortunate that unused variable warnings aren't detected
properly, the core functionality of the package is still fine, so let's
skip the test for now and wait until upstream figures out a solution.

pkgs/development/interpreters/evcxr/default.nix

@@ -20,6 +20,13 @@ rustPlatform.buildRustPackage rec {
   buildInputs = lib.optionals stdenv.isDarwin
     [ libiconv CoreServices Security ];
 
+  # test broken with rust 1.69:
+  # * https://github.com/evcxr/evcxr/issues/294
+  # * https://github.com/NixOS/nixpkgs/issues/229524
+  checkFlags = [
+    "--skip=check_for_errors"
+  ];
+
   postInstall = let
     wrap = exe: ''
       wrapProgram $out/bin/${exe} \