Talos II produce both tgz and zip archives, zip are unsupported for Talos

[tlaurion]

trafficstars

@JonathonHall-Purism any idea what is the cause? If you have quick fix, propose otherwise I'll check it out later.

[JonathonHall-Purism]

Not sure, it might be somewhere around https://github.com/linuxboot/heads/blob/master/Makefile#L185

There is already a ifneq ($(BOARD), talos-2) that's supposed to suppress the ZIP target, not sure why it would still generate one