grub-mkimage: Creating aarch64 images from x86 host is broken

grub-mkimage: Creating aarch64 images from x86 host is broken

A recent fix that made appears to have broken the ability to create an
aarch64 boot image on a x86-based host.

This was due to an overzealous testing of the architecture when building
grub-mkimage and removing the code that build an ARM image when not built
on ARM.

On the occasion remove redundant break.

Fixes: 8541f319 (grub-mkimage: Only check aarch64 relocations when built for aarch64)
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Tested-by: Selva Ganesan <selvaganesan89@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>