Disable build of kio_nfs for now, needs porting to WorkerBase
Never seen anyone using the nfs KIO worker, but someone out there might? Do we know anyone who is/might be interested into it?
Being one of the last consumer of the SlaveBase API though it currently blocks completing the move from SlaveBase to WorkerBase. KF6/KIO gets into frozen API state in the next weeks, so better very soonish KIO::SlaveBase finally is removed from the API and the implementation folded into KIO::WorkerBase, to see if there are further changed needed.
Having kio_nfs being ported to WorkerBase before, chances might be very low, given the complexity by existing code and domain and no known maintainer/code-writing stakeholder.
So I propose to pick a chapter from KDE4->KF5 times, and for now disable the nfs worker from the build. This should trigger someone who really needs/wants it to invest into porting it, otherwise it just might show actually no-one really needs it.