kexec-tools: Replace a submitted patch by the backported one

kexec-tools: Replace a submitted patch by the backported one

This replaces "kexec-tools: purgatory: fix build on `binutils-2.42`"
(Submitted upstream) by "Fix building on x86_64 with binutils 2.41"
(which was actually merged).

Upstream maintainers found the second patch more complete [0].

[0]: https://lore.kernel.org/all/ZbopWV9qrxMME2hU@MiWiFi-R3L-srv/T/

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>