klibc_2.0.2: refactor recipe to respect exec_prefix

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
klcc-cross_2.0.2: refactor recipe to respect exec_prefix

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
kexec-tools-klibc: fix includes now that klibc respects exec_prefix

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>