Signed-off-by: NPavel Roskin <proski@gnu.org>

Remove inneeded system includes.

Most system includes are not needed.  In particular, the hardware
backends don't need anything network related.  Some includes have been
moved from local headers to the C files where they are actually used.
Includes that have to be in the local headers are no longer from the C
sources.
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

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!