Set using_internal_features to false in Crubit's rustc_interface co…

…nfig.

[Commit 9d42b1e2683644d81e37d55468257cd612d906f6](rust-lang/rust@9d42b1e) introduced this flag as part of [the effort](rust-lang/compiler-team#596) to introduce a lint for using internal rustc features (which would also include "perma unstable" rustc features).

PiperOrigin-RevId: 578909357
Change-Id: I6ddd31e961a40ce8697b1b3010758e7bff269e6c

cc_bindings_from_rs/run_compiler_test_support.rs

@@ -100,6 +100,7 @@ where
         locale_resources: rustc_driver::DEFAULT_LOCALE_RESOURCES,
         ice_file: None,
         expanded_args: vec![],
+        using_internal_features: std::sync::Arc::new(false.into()),
     };
 
     rustc_interface::interface::run_compiler(config, |compiler| {