kexec-tools: Add support for build with x32 ABI in x86_64
Add autoconf test for detect when build is x32 ABI this enables to
test into purgatory Makefile to avoid use -mcmodel=large flag in CC.
Add ELFCLASS read and syscall number into kexec, see patch.
[YOCTO #7419]
(From OE-Core master rev:
7b75430c2e3ffedb9ef4198fabf259b757b9ce5a)
Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
