bug#58710: [PATCH] zeromq: New file and libzmq-4.3.4

[Liliana Marie Prikler]

$ guix show zeromq
name: zeromq
version: 4.3.4
outputs:
+ out: everything else
systems: x86_64-linux i686-linux
dependencies: 
location: gnu/packages/networking.scm:1345:2
homepage: https://zeromq.org
license: LGPL 3+
synopsis: Library for message-based applications  
description: The 0MQ lightweight messaging kernel is a library which
+ extends the standard socket interfaces with features traditionally
+ provided by specialized messaging middle-ware products.  0MQ sockets
+ provide an abstraction of asynchronous message queues, multiple
+ messaging patterns, message filtering (subscriptions), seamless access
+ to multiple transport protocols and more.