grub_func_test (video checksums tests)

[Andrei Borzenkov]

If I understand it correctly, it computes checksums of each frame on
gfxterm. But will not screen content depend on QEMU version, font
source used to create unifont and probably other? I.e. - how useful is
it to be included in distribution?

I ask because it fails for me and I'm not sure whether it's worth to
refresh checksums.h or simply ignore it.