mkinitcpio: add VERSION_ID to EFISTUB

Morten Linderudrequested to merge
github/fork/Foxboron/morten/version_id into master

This patch adds VERSION_ID to the built images. This helps distinguish between several kernel versions instead of having it fallback to showing file names. The sd-boot menu shows the new entires with the given kernel ID:

Old menu: * Arch Linux (arch-systemd.efi) * Arch Linux (test-efi.efi)

New menu: * Arch Linux (rolling) * Arch Linux (5.15.5-arch1-1)

Signed-off-by: Morten Linderud morten@linderud.pw

Edited by nl6720

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