Delta apply fail with "xdelta3: target window checksum mismatch: XD3_INVALID_INPUT"

Hi Mirzak,

I confirm that by adding

EXTRA_IMAGECMD_ext4 = "-i 4096 -O ^64bit"

the /dev/hda2 and /dev/hda3 are equal.

root@qemux86-64:~# cmp /dev/hda2 /dev/hda3

and the fix works as expected.

Thanks,
Mauro