Prevent warnings in FfiNative example (#479)

diff --git a/example/ffinative/generated_bindings.dart b/example/ffinative/generated_bindings.dart
index ea0436b..1bb65d0 100644
--- a/example/ffinative/generated_bindings.dart
+++ b/example/ffinative/generated_bindings.dart
@@ -1,3 +1,5 @@
+// ignore_for_file: deprecated_member_use
+
 // AUTO GENERATED FILE, DO NOT EDIT.
 //
 // Generated by `package:ffigen`.
diff --git a/example/ffinative/pubspec.yaml b/example/ffinative/pubspec.yaml
index 5ba0423..2132d8b 100644
--- a/example/ffinative/pubspec.yaml
+++ b/example/ffinative/pubspec.yaml
@@ -23,3 +23,5 @@
   headers:
     entry-points:
       - 'headers/example.h'
+  preamble: |
+    // ignore_for_file: deprecated_member_use
diff --git a/test/example_tests/ffinative_example_test.dart b/test/example_tests/ffinative_example_test.dart
index 6895a8e..779b41a 100644
--- a/test/example_tests/ffinative_example_test.dart
+++ b/test/example_tests/ffinative_example_test.dart
@@ -26,6 +26,8 @@
 ${strings.headers}:
   ${strings.entryPoints}:
     - 'example/ffinative/headers/example.h'
+${strings.preamble}: |
+  // ignore_for_file: deprecated_member_use
 ''') as YamlMap);
       final library = parse(config);