[ffigen] Disable health check for ffigen

[liamappelbe]

#1857

[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
ffi	None	2.1.3	2.1.3	2.1.3	✔️
jni	None	0.13.0	0.13.0	0.13.0	✔️
native_assets_builder	None	0.10.2	0.10.2	0.10.2	✔️
native_assets_cli	None	0.10.0	0.10.0	0.10.0	✔️
native_toolchain_c	None	0.7.0	0.7.0	0.7.0	✔️
objective_c	Non-Breaking	4.0.0	4.1.0-wip	4.1.0	✔️

Changelog Entry ✔️

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols
ffi	MallocAllocator CallocAllocator
jni	_opaque_pthread_mutex_t _opaque_pthread_cond_t _Dart_FinalizableHandle _ReferenceType
objective_c	ObjCBlockBase c._ObjCBlockImpl _ObjCBlockDesc _ObjCBlockRef _ObjCObject _Dart_FinalizableHandle _ObjCProtocol _ObjCSelector _ObjCMethodDesc _ObjCObjectRef _NSZone

This check can be disabled by tagging the PR with skip-leaking-check.

License Headers ⚠️

// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

Files
pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/native_assets_builder/test_data/native_dynamic_linking/bin/native_dynamic_linking.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

All source files should start with a license header.

This check can be disabled by tagging the PR with skip-license-check.