merge bitcoin#13530: Add missing pow.h header
merge bitcoin#13530: Add missing pow.h header

thelazier/dash,thelazier/dash,thelazier/dash,UdjinM6/dash,dashpay/dash,UdjinM6/dash,dashpay/dash,thelazier/dash,dashpay/dash,dashpay/dash,UdjinM6/dash,UdjinM6/dash,UdjinM6/dash,thelazier/dash,dashpay/dash