Fixed bug with configure still relying on ncdu.h
Fixed bug with configure still relying on ncdu.h

FauxFaux/ncdu,gitkaste/ncdu,sunny256/ncdu,piyo/ncdu,rofl0r/ncdu,guns/ncdu,guns/ncdu,ppetr/ncdu,ppetr/ncdu,ppetr/ncdu,guns/ncdu,rofl0r/ncdu,FauxFaux/ncdu,sunny256/ncdu,gitkaste/ncdu