Fixes pma#4078 ``` $ pmbootstrap build device-pine64-pinephonepro --force fails with: >>> device-pine64-pinephonepro: Entering fakeroot... install: can't stat '/home/pmos/build/src/bootaa64.efi': No such file or directory >>> ERROR: device-pine64-pinephonepro*: package failed >>> ERROR: device-pine64-pinephonepro: rootpkg failed ``` Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7308>