[hm] Fix WDT not disabling on gcc-4.9.2 (Atmel 3.5.3)
[hm] Fix WDT not disabling on gcc-4.9.2 (Atmel 3.5.3)

.init3 section was not being included after Arduino 1.6.10. Much thanks
to Andrew Fuller for discovering the GCC -flto cause.

shmick/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,shmick/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,CapnBry/HeaterMeter,CapnBry/HeaterMeter