Switch to android-15 here, too

Change-Id: If7b66e60fcf8af97a69e20af9c77793a163c4c17
Maybe we need libsblo.a for Android

Saw messages about that in logcat. Didn't help making the 'desktop' app work
again, though. I wonder when it last worked.

Change-Id: I32f7f32a30f3d00aa0754c00469ecddf2831aad5