Android UCI engine update: Stockfish dev't 2017.07.09.ACH

Alexei is the only active build maker for Android nowadays. Here's a Stockfish development version he provided. Merci bien!

GET Stockfish 8.0.2017.07.09.ACH for arm7 32-bit and arm8 64-bit

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