Revision 4469

Reboot newbuild development:
- sconfig, kconfig, most of kbuild is kept
- old build system is kept
- as few files as possible are different from upstream
  (r4466)
- newstyle boot process, and QEmu CAR is gone.
  One battle field at a time.

Results:
- abuild should build the same as usual
- kconfig QEmu builds and runs
- kconfig Kontron builds (but doesn't run yet)

Build isn't tested in this exact tree yet, as I copied over
the changes from an internal tree. I don't dare to touch it
any more, so it might require further commits to get it to
work as good as the internal copy.

There are still some issues in the build system, but
it's an improvement over what we had before, I think,
as we have a migration path now.