bug#22660: No horizontal scroll bars in NextStep build [OSX]

[martin rudalics]

> I notice that the NextStep build of Emacs (master, for example) does
> not offer the option for enabling the horizontal scroll bar in
> Options- Show/Hide - Scroll-bar. Only None, Left, Right is shown..

Indeed, horizontal scollbars have not been implemented for this build.

It should be pretty easy to add support for them, though.  I won't do it
because it doesn't make sense to do that without a machine running
NextStep.  But if somone would like to give it a try (some stubs should
be already present) I could certainly provide additional information.

martin