We're quite behind on updates for misc/screen, largely because there's
a "screen,shm" FLAVOR including a patch set that is used with misc/brltty
which can't easily be updated.
I'd like to split the patched version into a separate port so that the main
screen port can be updated independently. tgz for the screen-shm port is
attached, and there's a diff inline to remove/adjust the other parts.
(I'll also rm patches/shmpatch-*, but that's uninteresting noise so I've
left it out of the diff).