[Bug] Objcopy fails for some systemd boot images

[dilucide]

Description

Due to some EFI stubs being located at a VM address greater than zero, the current boot-loader install process fails with an objcopy error message stating that the section address is located below the image base. To remedy this, pull request #42 was created calculating the VMA offsets dynamically.

Reproduction steps

Perform a build and installation according to the README on Ubuntu 24.10 Desktop.

Current Behavior

On Ubuntu 24.10 Desktop, installation fails with a multiple objcopy [...]: section below image base errors.

Expected Behavior

The sectpmctl-boot script handles any EFI stub and does not rely on hard-coded values.

Additional information

No response