Android UCI engine update: McBrain 2.6.20170702

Thanks to Alexei for compiling this version of McBrain, a tweaked Stockfish, maintained by Micheal Byrne. You can read more about it HERE.

GET McBrain 2.6.20170702.ACH for arm7 and arm8

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