Espruino build for nRF52832 board with external low-frequency 32678 kHz crystal

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sebi
It seems enabling the DC/DC regulator doesn't improve (always?) performances: check my post on GitHub where I compare different settings on a nRF51 board programmed to be a beacon in C. Enabling the low-frequency crystal does improve power consumption thought.

I am planning to do the same comparison with my FEASYCOM FSC-BT630 (nRF52) as soon as I get it. Additionally I would like to compare the beacon when programmed using Espruino (see this post for the original code). But from my current tries with my Holyiot YJ-17095 board, it seems the Espruino version consumes about 45uA so about 5 to 6 times more than the beacon version in C.

I can't explain this as I thought
```
NRF.setAddress(mac);
NRF.setAdvertising(adv, {interval:5000});
```
required restarting the BLE stack with different settings (disabling the communication with the IDE, etc) that would make this code running very similar to the code directly generated from C.

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