grub will install efi kernels on non-efi system

[Xen]

Grub installs efi kernels into grub.cfg with grub-mkconfig on non-uefi 
systems.

The Ubuntu /etc/grub.d/10_linux checks for the existence of 
/sys/firmware/efi but Git grub does not.

I don't know how to fix it other than by copying the file over.

Regards.