Manual cloning of `shaderc` needed when building for Android on Windows ?

[James0124]

Running update_external_sources_android.bat seemed to fail with shaderc directory not being present in build-android/third_party,
presumably because there's no entry for shaderc in build-android/known_good.json.

I needed to manually clone shaderc into build-android/third_party and run utils/git-sync-deps inside it before ndk-build -j 8 started working.

Is this expected, or am I missing something?