boot/shim: Fix build with binutils 2.46

Buildroot commit 101997e334efcbfd9bde3100ae75400177cfa56f added binutils
2.46.0 to -next branch causing a build error with shim:

output/per-package/shim/host/bin/x86_64-buildroot-linux-gnu-objcopy:
 shimx64.so: file format not recognized
output/per-package/shim/host/bin/x86_64-buildroot-linux-gnu-objcopy:
 mmx64.so: file format not recognized

Added an upstream patch to fix the problem.

No backport to buildroot LTS branches necessary.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>