vme64x-core repository not accessible as submodule anymore
This is one of the cases in which a repository belongs to a non-leaf node in the hierarchy.
We have projects like https://ohwr.org/hdl-core-lib/vme64x-core/legacy-vme64x-core https://ohwr.org/hdl-core-lib/vme64x-core/vme-rf-wr-bobr
and there was a https://ohwr.org/hdl-core-lib/vme64x-core/ project with its repository.
Reported by @lipinskimm