help update cad/z88 port

[Anton Shterenlikht]

>On Fri, Jul 3, 2015 at 11:37 AM, Anton Shterenlikht <mexas at bris.ac.uk> wrote:
>> I'm stuck on the patching stage:
>>
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201250
>>
>
>Your bug report was difficult to interpret; what exactly is the problem?
>You know about 'make makesum' to update distinfo checksums, right?

The PR provides a patch to update the new location
of the disfile and a new distinfo accordingly.

I cannot figure out how the patch files should be updated
after make extract. I tried, but got lost in paths so
I cannot apply even the first patch cleanly.
This is what I need help with. It also seems that the
code structure might have changed, so the build process
might have to change too. But for now I just want to
update all patches under files.

Thank you

Anton