There was only two users left of descend. Fix them so they
use $(clean)= and $(build)=.
Drop definition of descend.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
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Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!