Resubmission of patch to add --without-* support

Hi guys,

the patch in attachment allows to disable the build/install targets for each specific subsystem in the tree.

It also does a major clean up of top level Makefile thanks to Joel Becker input/suggestions.

Some targets (specifically the kernel build targets have changed).

Usual apply/ACK disclaimer.

Cheers
Fabio

I'm going to make him an offer he can't refuse.
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Feh.. disregard this patch. It's missing a hunk. New one will be on the way soon.

Fabio

I'm going to make him an offer he can't refuse.