xf86-video-vesa: Changes to 'not-on-efi'

Wed Aug 29 18:56:02 UTC 2018

Rebased ref, commits from common ancestor:
commit 2645e0aa9c17c2c966a0533e52ad00510311483e
Author: Adam Jackson <ajax at redhat.com>
Date:   Wed Aug 29 11:04:23 2018 -0400

    Refuse to run on UEFI machines
    
    No possible good can come of this.
    
    v2: Check for .../efi-framebuffer.0 ("is there an EFI framebuffer")
    instead of /sys/firmware/efi ("is this an EFI machine"). Suggested by
    Peter Jones.
    
    Reviewed-by: Peter Jones <pjones at redhat.com>
    Signed-off-by: Adam Jackson <ajax at redhat.com>