shim-15.6 commits d6eb9c6c depends on
"objcopy --target efi-app-aarch64" command during aarch64 build.
Backport upstream patch to support it.
Signed-off-by: Chenxi Mao <chenxi.mao@suse.com>
(cherry picked from commit 038d1fbfdf78558f3d914fdcc8ca8f02768bef45)
