kernel/linux: add xz-ed linux tarballs

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Message-Id: <f249828223fc75313bee.1363860871@NX5000>
Patchwork-Id: 229618

# Compute Alpha-specific values

CT_DoArchTupleValues () {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}${CT_ARCH_SUFFIX:-${CT_ARCH_ALPHA_VARIANT}}"

}