Target 32 and 64 bit architectures on Android

ProjectSettings/ProjectSettings.asset

   clonedFromGUID: 56e7a2d3a00f33d44bdd161b773c35b5
   templatePackageId: com.unity.3d@1.0.0
   templateDefaultScene: Assets/Scenes/SampleScene.unity
-  AndroidTargetArchitectures: 1
+  AndroidTargetArchitectures: 3
   AndroidSplashScreenScale: 0
   androidSplashScreen: {fileID: 0}
   AndroidKeystoreName: '{inproject}: {inproject}: '
     27: UNITY_POST_PROCESSING_STACK_V2
   platformArchitecture:
     iPhone: 1
-  scriptingBackend: {}
+  scriptingBackend:
+    Android: 1
   il2cppCompilerConfiguration: {}
   managedStrippingLevel: {}
   incrementalIl2cppBuild: {}