bug#65982: more info

[Gabriel Wicki]

commit b0d47d9e18e52ff7935aebe6ab37e702f58101be (Update u-boot to
2023.07.02) breaks creation of a bootable image.

Building in a time-machine at commit
d6a53849935f8584e1df57faa79c18c23fbb2aa1 works as expected.