Remove the ability to link to the old initial boot entry.
Remove the ability to link to the old initial boot entry.

The information we would need to make that work doesn't
actually exist on the ISO, so it is not a capability
that we can support.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@gmail.com>

clalancette/pyiso,clalancette/pycdlib