Restore deskutils/zanshin after it was deleted in r522617.
(I hope I got the repocopy right; I don't really know how kde@ missed
the pending deprecation and removal of this port, we should have been
on top of it much earlier.)
Add patches obtained from Debian (which has some own work, and
some patches pulled from upstream git) to make it build with current
ports (Boost, KDE Frameworks, and KDE PIM). Tested with a poudriere
build on amd64.
The Debian patches are at
https://salsa.debian.org/qt-kde-team/extras/zanshin/tree/master/debian/patches
There's a similar set of openSUSE patches at
https://build.opensuse.org/package/show/KDE:Extra/zanshin
We'll prod upstream about a new release.
Reported by: rene
Obtained from: Debian