"Build a musical game" codelab fails to build

Android version(s): 11.0
Android device(s): Pixel_3a_API_30_x86
Oboe version: 1.5.0
App name used for testing: RhythmGame

**Short description**
Build fails on Page 3, Step 1 of code lab at [https://developer.android.com/codelabs/musicalgame-using-oboe#2](https://developer.android.com/codelabs/musicalgame-using-oboe#2)

**Steps to reproduce**
Follow the code lab exactly.

1) clone oboe and checkout codelab branch:
```
git clone https://github.com/google/oboe
cd oboe
git checkout game-codelab
```

2) Open `oboe/samples` in Android Studio 4.1.2

3) Choose"RhythmGame" run configuration and press ctrl+R to run

**Expected behavior**

App compiles and runs showing yellow screen on virtual device.

**Actual behavior**

Build fails with:
```
A problem was found with the configuration of task ':RhythmGame:processNdkExtractorDebugManifest' (type 'ProcessMultiApkApplicationManifest').
> File 'E:\Projects\oboe\samples\RhythmGame\build\intermediates\merged_manifest\ndkExtractorDebug\out\AndroidManifest.xml' specified for property 'mainMergedManifest' does not exist.
```

**Device**

Windows 10, Android Studio AVD