How to disable bluetooth BLE on a Genuino 101?

Bluetooth is notorious for outsider hacking, and I want to disable it on my Genuino 101.

What code should I type into the Arduino IDE in order to disable the BLE bluetooth?

The bluetooth part of the board will do nothing if there no code in the sketch to read from it/write to it. If you don't want to use the bluetooth capabilities, don't write any code to use them.