In nRF5 SDK 16 (downloaded file nRF5SDK160098a08e2.zip), the components/boards/pca10059.h file is missing the LED_START and LED_STOP defines that are present for other boards.
This causes problems for instance when trying to build examples with the Mesh SDK 3.2.0, and I am guessing may cause problems with other examples as well.
I believe the fix is as easy as adding the following lines at line 63 in components/boards/pca10059.h:
#define LED_START LED_1
#define LED_STOP LED_4
Note that the nRF5 SDK for Mesh v3.2.0 does not support the nRF5 SDK v.16.0.0, but is to be used together with nRF5 SDK v.15.3.0.
I don't know how this is going to be handled in future releases but it seems that the fix you added below should be fine.