stub: do not assumr secure boot on systems without support for it
stub: do not assumr secure boot on systems without support for it

freedesktop-unofficial-mirror/gummiboot,trilean/gummiboot,miguelinux/gummiboot2systemd-boot,aaronp24/gummiboot,miguelinux/gummiboot2systemd-boot,aaronp24/gummiboot,freedesktop-unofficial-mirror/gummiboot,trilean/gummiboot