Fix Android build (#23)

* Upgrade Android NDK

* Use Android emulator 30.7.3 on macos

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
         shell: bash
         run: |
           echo "ANDROID_HOME=$ANDROID_HOME" >> $GITHUB_ENV
-          echo "ANDROID_NDK_VERSION=21.3.6528147" >> $GITHUB_ENV
+          echo "ANDROID_NDK_VERSION=21.4.7075529" >> $GITHUB_ENV
       - name: Cached Android NDK
         uses: actions/cache@v2
         with:
@@ -80,6 +80,8 @@ jobs:
         uses: reactivecircus/android-emulator-runner@v2
         with:
           api-level: 29
+          emulator-build: 7425822  # workaround to emulator bug: https://github.com/ReactiveCircus/android-emulator-runner/issues/160
+          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
           ndk: ${{ env.ANDROID_NDK_VERSION }}
           cmake: 3.10.2.4988404
           script: ./gradlew connectedCheck