Android UCI engine update: Cichess 1.5a.20170720.ACH

CiChess is yet another tweaked Stockfish derivative. As there are already newer versions to share here, take this as a copy for collectors.

GET Cichess 1.5a.20170720.ACH for arm7 and arm8

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