Update devel/zmq (once more, this time Cc ports@)

[Mark Martinec]

Michael Gmelin wrote:
> any chance you'll update zmq to the latest version in the near future,
> or at to least 3.2.4? sysutils/py-salt depends on it and has keep-alive
> issues with the old/outdated version.

Not just keep-alive, the Salt needs libzmq version 3 for IPv6 support.

The Salt authors state that libzmq version 2 is often unreliable,
the version 3 now solves most of their reliability/stability issues.

William Grzybowski wrote:
> You should open a PR, that way it will timeout and then someone can
> take care of it regardless of the maintainer availability.

It's not just py-salt, another port relying on version 3 of libzmq
is amavisd-new, as version 2 of libzmq does not support IPv6
and version 3 does.

IMO the devel/zmq should switch to zmq version 3.2.4
which is now in devel/zmq-devel, and the zmq-devel should
switch to version 4.

Also the perl module ZeroMQ (port net/p5-ZeroMQ) is no longer maintained
and should be supplemented by perl modules  by the same author:
ZMQ-Constants, ZMQ-LibZMQ3, ZMQ, (and ZMQ-LibZMQ2 for backward
compatibility with old libzmq).

  Mark