Fix Unity 6000 Il2CppCodeGeneration settings. Apply OptimizeSpeed for release exports.

Author: timbotimbo

example/unity/DemoApp/Assets/FlutterUnityIntegration/Editor/Build.cs

@@ -211,8 +211,8 @@ private static void DoBuildAndroid(String buildPath, bool isPlugin, bool isRelea
                 playerOptions.options = BuildOptions.AllowDebugging | BuildOptions.Development;
             }
             #if UNITY_6000_0_OR_NEWER
-                PlayerSettings.SetIl2CppCompilerConfiguration(UnityEditor.Build.NamedBuildTarget.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
-                PlayerSettings.SetIl2CppCodeGeneration(UnityEditor.Build.NamedBuildTarget.Android, UnityEditor.Build.Il2CppCodeGeneration.OptimizeSize);
+                PlayerSettings.SetIl2CppCompilerConfiguration(NamedBuildTarget.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
+                PlayerSettings.SetIl2CppCodeGeneration(NamedBuildTarget.Android, isReleaseBuild ? Il2CppCodeGeneration.OptimizeSpeed : Il2CppCodeGeneration.OptimizeSize);
             #elif UNITY_2022_1_OR_NEWER
                 PlayerSettings.SetIl2CppCompilerConfiguration(BuildTargetGroup.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
                 PlayerSettings.SetIl2CppCodeGeneration(NamedBuildTarget.Android, isReleaseBuild ? Il2CppCodeGeneration.OptimizeSpeed : Il2CppCodeGeneration.OptimizeSize);
@@ -438,8 +438,8 @@ private static void BuildIOS(String path, bool isReleaseBuild)
             #endif
 
             #if UNITY_6000_0_OR_NEWER
-                PlayerSettings.SetIl2CppCompilerConfiguration(UnityEditor.Build.NamedBuildTarget.Android, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
-                PlayerSettings.SetIl2CppCodeGeneration(UnityEditor.Build.NamedBuildTarget.Android, UnityEditor.Build.Il2CppCodeGeneration.OptimizeSize);
+                PlayerSettings.SetIl2CppCompilerConfiguration(NamedBuildTarget.iOS, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
+                PlayerSettings.SetIl2CppCodeGeneration(NamedBuildTarget.iOS, isReleaseBuild ? Il2CppCodeGeneration.OptimizeSpeed : Il2CppCodeGeneration.OptimizeSize);
             #elif UNITY_2022_1_OR_NEWER
                 PlayerSettings.SetIl2CppCompilerConfiguration(BuildTargetGroup.iOS, isReleaseBuild ? Il2CppCompilerConfiguration.Release : Il2CppCompilerConfiguration.Debug);
                 PlayerSettings.SetIl2CppCodeGeneration(NamedBuildTarget.iOS, isReleaseBuild ? Il2CppCodeGeneration.OptimizeSpeed : Il2CppCodeGeneration.OptimizeSize);