To prepare kbuild for more kernel packaging formats move all packaging support
to scripts/package.

In top-level Makefile introduce generic support for all package formats using
target names *-pkg.  Included the old rpm target for backward compatibility.

A new variable KBUILD_IMAGE is used to specify what kernel image will be part
of the final package, and is to be set by the arch specific makefile.
KBUILD_IMAGE may be overridden from command line or environment.  KBUILD_IMAGE
will see wider usage later, mainly when installing kernel images.

Introducing KBUILD_IMAGE allowed arch specific details to be deleted from the
mkspec and builddeb scripts.

While in the process added the deb packet format.  Script is From: Wichert
Akkerman <wichert@wiggy.net>

To create a RPM packet use 'make rpm-pkg'.
To create a deb packet use 'make deb-pkg'.
Both targets are included in 'make help'
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>