Comment instead of delete the ndkPath in the Unity export.

Author: timbotimbo

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

@@ -334,7 +334,8 @@ private static void ModifyAndroidGradle(bool isPlugin)
             buildText = buildText.Replace("enableSplit = true", "enable true");
             buildText = buildText.Replace("implementation fileTree(dir: 'libs', include: ['*.jar'])", "implementation(name: 'unity-classes', ext:'jar')");
             buildText = buildText.Replace(" + unityStreamingAssets.tokenize(', ')", "");
-            buildText = Regex.Replace(buildText, "ndkPath \".*\"", "");
+            // disable the Unity ndk path as it will conflict with Flutter.
+            buildText = buildText.Replace("ndkPath \"", "// ndkPath \"");
 
             // check for namespace definition (Android gradle plugin 8+), add a backwards compatible version if it is missing.
             if(!buildText.Contains("namespace"))