Prevent Android Emulator from showing a popup dialog on first start

The CI android emulator gives a pop-up dialog saying (eminently reasonably) "Emulator is running using nested virtualization. This is not recommended. It may not work at all. And typically the performances is not quite good." The dialog has a "Never show this again" check-box. It may make sense, if someone can, to track down where it stores the fact that you checked that before clicking OK, so that we can add a provisioning step (along with set-up of the Android emulator) to fake having been through this dialog and checked that check-box, as it's never a good idea to have Coin provoke dialogs on its VMs.