build: Simplify the makefile
build: Simplify the makefile

This patch makes some simplifications to the Makefile to make it
easier to read.

ZhongtianWang/quilt,stevenlin598/quilt,stevenlin598/quilt,ejj/quilt-dev,akshayknarayan/quilt,tejasmanohar/quilt,stevenlin598/quilt,stevenlin598/quilt,kelda/kelda,kayousterhout/quilt,PenguinToast/quilt,secant/quilt,akshayknarayan/quilt,PenguinToast/quilt,mmussomele/quilt,NetSys/quilt,ejj/quilt-dev,kklin/kelda,kelda/kelda,tejasmanohar/quilt,mmussomele/quilt,mmussomele/quilt,mmussomele/quilt,kklin/quilt,mmussomele/quilt,ZhongtianWang/quilt,tejasmanohar/quilt,PenguinToast/quilt,kelda/kelda,ZhongtianWang/quilt,kayousterhout/quilt,secant/quilt,kklin/kelda,PenguinToast/quilt,kayousterhout/quilt,NetSys/quilt,quilt/quilt,kklin/quilt,secant/quilt,kklin/kelda,quilt/quilt,stevenlin598/quilt,LuiseV/quilt,mmussomele/quilt,stevenlin598/quilt,PenguinToast/quilt,NetSys/quilt,LuiseV/quilt,akshayknarayan/quilt,kelda/kelda,kayousterhout/quilt,quilt/quilt,NetSys/quilt,NetSys/quilt,LuiseV/quilt,LuiseV/quilt,secant/quilt,kklin/kelda,quilt/quilt,ZhongtianWang/quilt,akshayknarayan/quilt,LuiseV/quilt,ejj/quilt-dev,kklin/quilt,ejj/quilt-dev,kklin/quilt,secant/quilt,tejasmanohar/quilt