`res_ninit` missing

[d-e-s-o]

I see the crate provides res_init function, but it seems to be missing res_ninit (see res_ninit(3)). Is there any reason for that? Or can it be added? (will likely also require res_nclose then)

[d-e-s-o]

And of course that's when I stumble across #4611. Hmpf.