Android UCI engine update: Arasan 20.4.ACH

Another update to Arasan, shortly after 20.3. I guess this one will force the 3000 ELO barrier even in Android. Koodos to Jon Dart, the author and Alexei, the Android build maker.

GET Arasan 20.4.ACH for arm7 & arm8

In case of trouble downloading from PC, use your mobile or refer to THIS POST.