bug#30120: 26.0.90; Building with X toolkit without toolkit scroll bars broken on release branch and master

[martin rudalics]

> Continues to work fine for me on rhel7.
> You reported the same thing previously in
> https://debbugs.gnu.org/27816#113
> and implied that it went away if you did a clean build.

Thanks for the reminder.  Hopefully, I have now removed the last
remnants of this "thing".

martin