It's better to have one type of system that can do either distributed or
local builds than to have separate ones that must both be kept up to
date with changes.
The need for a separate 'distbuild' stratum went already:
Author: Richard Maw <email@example.com>
Date: Thu Oct 2 14:16:00 2014 +0000
Split morph out of tools
morph now contains distbuild and morph-cache-server, so the distbuild
stratum can go away, and anything that needs it can now use morph.