Change all of the builds to use $(MAKE) instead of the /usr/bin/make.
Download and build GNU make-4.2 if the wrong version is installed
on the system.
Re-invoke build/make-4.2/make with the target that was passed in once
the correct make has been built.
No patches are required to boot 4.9 as a coreboot payload,
unlike the 4.7 kernel that required a head_64.S patch.
The new kernel is about 40 KB larger than the 4.7; the
config might be shrinkable.
Close issue #61.
This touches most of the module configurations since the
coreboot build process had to add a few new features.
The Linux kernel could make use of it as well if we need
separate x230/chell/qemu kernels, for instance.
