"fix" efi booting with disgusting hack and out-of-repo binary

it turns out all that we need to do to make EFI booting
work is to replace the BOOTX64.EFI file that is produced
by GRUB's "grub-install" command with the version of that
file from Ventoy's upstream source of the same file:
<https://github.com/ValdikSS/Super-UEFIinSecureBoot-Disk/>.

Ventoy claims that to be their source here:
<https://github.com/ventoy/Ventoy/blob/master/DOC/BuildVentoyFromSource.txt>
"""
 5.10 UEFIinSecureBoot
 https://github.com/ValdikSS/Super-UEFIinSecureBoot-Disk/releases
 Super-UEFIinSecureBoot-Disk_minimal_v3.zip
 unzip it and get Super-UEFIinSecureBoot-Disk_minimal.img, extract the img by 7zip.
 INSTALL/EFI/BOOT/BOOTX64.EFI --> EFI/BOOT/BOOTX64.EFI SHA-256:
 475552c7476ad45e42344eee8b30d44c264d200ac2468428aa86fc8795fb6e34
"""

That SHA-256 matches what we have downloaded and are using.

I have created a separate repo containing the code that pulls down the
.zip file and extract the BOOTX64.EFI file from it.  That code verifies
the SHA-256 hash.  It can be added as a sami.git submodule.

This code is not usable without that file generated by that code.  This
commit should be amended with a git submodule added with that code too.

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