Rebasing x11/motif on actively maintained fork

Upstream Motif hasn't seen activity in nearly 3 years.
https://sourceforge.net/p/motif/code/ci/master/tree/

On one hand, I favor slow-paced development and I'm ok with periods
of inactivity. In addition, the niche of Motif applications doesn't
exactly overlap with that of cutting edge software.

On the other hand, I bumped across this actively maintained fork,
which published a major release just a month ago:
https://github.com/thentenaar/motif/releases

The rationale behind this fork is explained in the project's homepage:

> This fork of Motif was born of a desire to keep Motif (and other X11
> technologies) alive and well. The original upstream Sourceforge project
> hasn't had any activity in over two years, none of the project admins
> have been active for at least that amount of time, the official bug
> tracker has disappeared into the void; and the user forum was closed way
> back in 2017. Sadly, it appears that the original upstream has abandoned
> the project.

> I've incorporated some fixes from upstream that have laid dormant for
> years, a few others from Gentoo, and made a few improvements of my own.
> I intend to maintain this fork, and in doing so advocate for the
> continued use of the user interface toolkit that defined an era, and
> influenced many of the user interfaces that came after it

v2.4.0 seems to bring many enhancements and bug fixes over 2.3.8 so it
may be worth taking a look at it, testing it with some applications and
evaluate the possibility of moving x11/motif to such fork. I haven't
done this myself, and can't tell whether it would break any package
depending on it, but I would give it a shot if there's any interest in
it. 

-- 
PVO