[efitools] EFI binaries do not boot

[sarunint]

Describe the bug

The EFI binaries (KeyTool.efi etc) don't boot correctly when used.

Steps To Reproduce

Steps to reproduce the behavior:

1. Format a USB drive to FAT32 with ESP flag
2. Copy KeyTool.efi from Nix store to /EFI/BOOT/BOOTx64.efi
3. (Optional) Sign the efi file if needed for secure boot
4. Boot a computer using the USB drive

Expected behavior

KeyTool should launch

Screenshots

KeyTool doesn't launch. It's a black screen with no errors.

Additional context

I tried download the same file from other distribution, it works.

Metadata

 - system: `"x86_64-linux"`
 - host os: `Linux 6.12.4, NixOS, 25.05 (Warbler), 25.05.20241219.d70bd19`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.24.11`
 - nixpkgs: `/nix/store/8fwsiv0hd7nw1brkvka0jf1frk3m7qkr-source`

Notify maintainers

@grahamc

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