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[juergw]

PiperOrigin-RevId: 932451632

Some changes to the android build, so that we can run tests on emulators.

• Allocate more ram, because I got some out-of-memory errors without that.
• Use an older version of "ndk", because the newer one produces code that doesn't work on older phones. I'll use to oldest version still supported here: https://github.com/android/ndk/wiki. Also, note that v28 is not mentioned there, so I think we shouldn't use that.
• Use older versions of BouncyCastle. Because the tests on android don't work with newer version.
• Add flag to make sure that alignment is 16k, as suggested here: https://developer.android.com/guide/practices/page-sizes#compile-r27-lower
• Add android test target, so that it can be run with:
  ./gradlew :conscrypt-android:connectedAndroidTest -PcheckErrorQueue
• added "multiDexEnabled true", because the test build doesn't fit into one dex.