xlint is currently a fossil. We have much more useful and alive tools to do now what xlint did twenty years ago.
I did not cleared some stuff which makes lint operational, in x86/include, but I might do it as followup. The x86/include/ucontext.h and _types.h hacks made to please lint was the main reason for my initial proposal to classify xlint as obsolete and to remove it.
Also I do not intend to clear sccs ids.