Armeb removal before 12

[Warner Losh]

I'd like to remove armeb before 12.0.

It's poorly supported today.

Nobody has tested the concurrency kit changes on it. And ck is now
mandatory. We don't even know if it works or not.

Last time we asked, it took quite a while to find users.

It maxes out at 256MB of RAM. This is barely large enough for FreeBSD to
run in.

The hardware was last made almost a decade ago.

It uses non-standard non-mainstream boot loaders (boot technology has moved
on from redboot).

The cost of doing API sweeps, make universe runs, etc exceeds the benefit
to the project.

So, given all these factors, it sounds like a good candidate for retirement.

Therefore, I'd like to remove it on July 15th.

Comments? (please keep  them on topic to this specific thing: there's other
things that may also be past their freshness date, we'll discuss those in a
separate thread).

Warner