I'm typically against adding things to libiberty "because there's no other place for them". The purpose of libiberty is to provide a portability layer, not a trash can. However, htab is already in there, and the argument for putting its accessors there is sound.
However, most of the other functions in hashtab.h are of the form htab_*(). Could these be changed to match that pattern? If these functions are unused, it shouldn't matter to rename them. (although, if they're unused, it shouldn't matter to discard them, either)
